The Just War principle of jus ad bellum explicitly requires a reasonable prospect of success; the prevailing view about personal self-defence is that it can be justified even if the prospect of success is low. This chapter defends the existence of this distinction and goes on to explore the normative basis of this difference between defensive war and self-defence and its implications. In particular, the chapter highlights the rationale of the ‘success condition’ within Just War thinking (...) and argues that this condition is grounded in assumptions about the nature of political authority and responsibility that do not apply to personal self-defence. This important difference is commonly ignored or side-lined by contemporary theorists who regard the principles of these two types of conflict as very closely aligned and the moral differences between them as matters of degree only. (shrink)

Wars are large-scale conflicts between organized groups of belligerents, which involve suffering, devastation, and brutality unlike almost anything else in human experience. Whatever one’s other beliefs about morality, all should agree that the horrors of war are all but unconscionable, and that warfare can be justified only if we have some compel- ling account of what is worth fighting for, which can justify contributing, as individu- als and as groups, to this calamitous endeavour. Although this question should obviously be central (...) to both philosophical and politi- cal discussion about war, it is at the forefront of neither. In recent years, philosophical discussion of warfare has bloomed, but the debate has focused on whom we may kill, on the assumption that our aims are justified.1 Political debate, meanwhile, is more concerned with matters of prudence, international law, and public justification, than with reassessing what is worth fighting for. For wars of intervention to halt or prevent massive humanitarian crises, this gap is not so troubling. When warfare is the only means to prevent the mass killing or enslavement of the innocent, the purposes of military force are clear enough (though undoubtedly many other problems remain). The problem is more pressing, how- ever, for the justification of national defence.3 Although common-sense morality and international law view national defence as the paradigm case of justified warfare, grounding this consensus is surprisingly difficult.4 We typically believe that any state is justified in using lethal force to protect its territory against any form of uninvited military incursion by any other state. And yet we lack a good argument to explain why this should be so. In this chapter, I explain why one familiar and otherwise plausible approach to the justification of killing in war cannot adequately ground common-sense views of permissible national defence.5 Reductionists believe that justified warfare reduces to an aggregation of acts that are justified under ordinary principles of interpersonal morality.6 The standard form of reductionism focuses on the principles governing killing in ordinary life, specifically those that justify intentional killing in self- and other-defence, and unintended but foreseen (for short, collateral) killing as a lesser evil. Justified warfare, on this view, is no more than the coextension of multiple acts justified under these two principles. Reductionism is the default philosophical approach to thinking through the ethics of killing in war. It makes perfect sense to ask what principles govern permissible kill- ing in general, before applying them to the particular context of war. If it cannot deliver a plausible set of conclusions about when national defence is permitted, then we must either revise our beliefs about which conclusions count as plausible, or else face the significant challenge of developing a different theoretical model for justifying war- fare—an exceptionalist model, which views war as an exception to the regular moral landscape, to which principles apply which apply to nothing else but war.7 We must show, in other words, that there is something worth fighting for in wars of national defence, which is not engaged when we use force in any other context. The chapter proceeds as follows. Section 2.2 sets out the argument against reduc- tionism.8 Section 2.3 considers and rebuts one common response to the argument, which has often been thought sufficient grounds to disregard its conclusion. Section 2.4 then asks whether a modified reductionism would survive unscathed by the argu- ment. Finally, section 2.5 sets out some desiderata on a plausible exceptionalist alterna- tive. Section 2.6 concludes. (shrink)

The reductivist view of war holds that the moral rules of killing in war can be reduced to the moral rules that govern killing between individuals. Noam Zohar objects to reductivism on the grounds that the account of individual self-defence that best supports the rules of war will inadvertently sanction terrorist killings of non-combatants. I argue that even an extended account of self-defence—that is, an account that permits killing at least some innocent people to save one's (...) own life—can support a prohibition on terrorism, provided that it distinguishes between direct and indirect threats. What such an account cannot support is the blanket immunity of non-combatants to defensive killing. If a non-combatant is morally responsible for indirectly threatening in an unjust war, she can be liable to defensive killing. However, this gives us reason to revise our account of permissible killing in war, rather than to reject the reductivist account. (shrink)

If a threat is liable to be defensively killed, there is a defeasible justification for killing her. On certain prevailing assumptions about liability, which I accept, there are liability justifications for killing any number of minimally responsible threats, each of whom would otherwise kill a single non-responsible victim. Absent harms to third parties, these justifications appear, counter-intuitively, to be undefeated. I argue that this counter-intuitive appearance is deceptive.

_ Source: _Page Count 9 If a threat is liable to be defensively killed, there is a defeasible justification for killing her. On certain prevailing assumptions about liability, which I accept, there are liability justifications for killing _any number_ of minimally responsible threats, each of whom would otherwise kill a single non-responsible victim. Absent harms to third parties, these justifications appear, counter-intuitively, to be undefeated. I argue that this counter-intuitive appearance is deceptive.

ABSTRACT In the standard case of justifiable killing in self‐defence one agent without provocation tries to kill a second agent and the second agent's only way to avoid death is to kill his attacker. It is widely accepted that such killings in self‐defence are morally justifiable, but it has proved difficult to show why this is so. Recently, Montague has put forward an account in terms of forcing a choice between lives, and Teichman has propounded a (...) quasi‐Hobbesian rights‐based account of self‐defence. I argue that neither Montague nor Teichman has succeeded in providing an adequate justification for killing in self‐defence. (shrink)

Although people generally agree that innocent targets of culpable aggression are justified in harming the aggressors in self-defence, there is considerable disagreement regarding whether innocents are justified in defending themselves when their doing so would harm other innocent people. I argue in this essay that harming innocent aggressors and active innocent threats in self-defence is indeed justified under certain conditions, but that defensive actions in such cases are justified as permissions rather than as claim rights. This (...) justification therefore differs from that of self-defence against culpable aggressors, since defensive acts of the latter type are justified as claim rights rather than mere permissions. I argue, however, that the two justifications are alike in that both rest on considerations of distributive justice. (shrink)

Most studies on the ethics of privacy focus on what others ought to do to accommodate our interest in privacy. I focus on a related but distinct question that has attracted less attention in the literature: When, if ever, does morality require us to safeguard our own privacy? While we often have prudential reasons for safeguarding our privacy, we are also, at least sometimes, morally required to do so. I argue that we, sometimes, ought to safeguard our privacy for the (...) sake of the possible wrongdoer, in order to prevent the possible wrongdoer from committing a morally defiling act that renders them worse off. I illustrate the variety of cases in which this duty binds us and contrast my view to some other claims in the literature which also purport to show that we sometimes have a duty to safeguard our own privacy. (shrink)

Historians of political thought have begun to discover how contemporaries attempted to argue about armed conflict within the body politic without giving licence to anyone to escape order and subjection. During the sixteenth and seventeenth centuries, the concept of 'self-defence' became of overriding importance. English and Scottish interest in German affairs grew after the battle at the White Mountain in 1620. English and Scottish pamphleteers and writers subsequently began to recognize some of the argument concerning 'self-defence' (...) that had been elaborated in the Empire until this point. As the English 'ancient constitution' began to crumble under the mounting pressure of conflict between King and Parliament from 1642 onwards, the exhaustive philosophical and legal reasoning on the nature and basis of the body politic found within political texts emanating from Germany thus appeared increasingly attractive. However, as German ideas on self-defence were used, they underwent a significant transformation within their new English context. Because the sovereignty of the King in Parliament did not allow the integration of German ideas on self-defence based on the peculiar nature of sovereignty in the Empire, English thought gradually transformed the state of necessity in German thought into ideas of a state of nature. (shrink)

ABSTRACT The paper begins with the suggestion that the aura of respectability that surrounds the notion of self‐defence may render that notion suitable as a rallying point for agreement on the ethical legitimacy of warfare. I first argue that self‐defensive killing by a person X is morally justified if three conditions obtain: (1) X is together with at least one other person in a situation in which one of the persons will be killed through actions of the (...) other person(s); (2) X is not responsible for bringing about that situation; (3) unless X kills another person, X him‐ or herself will be killed. Next, I show that on the basis of this principle military operations are morally justified only if there are no alternatives to executing them that would save more lives or prevent the total loss of freedom for people. The paper concludes with the observation that the morality of individual self‐defensive killing is unable to justify most of current national defence policies. (shrink)

Traditional state v. state war is largely a relic. How then does a nation-state protect itself - preemptively - against the unseen enemy? Existing international law - the Caroline Doctrine, UN Charter Article 51, Security Council Resolutions 1368 and 1373 - do not provide sufficiently clear guidelines regarding when a state may take preemptive or anticipatory action against a non-state actor. This article proposes rearticulating international law to allow a state to act earlier provided sufficient intelligence is available. After examining (...) international law, this article proposes a process-based "strict-scrutiny" approach to self-defense. Under this approach, the executive will have to convince a court, based on relevant, reliable, viable, and corroborated intelligence, that preemptive action is appropriate. This process leads to a check on the power o the executive by placing a judicial check on preemptive action, consequently establishing objective legal criteria for operational counterterrorism. Muge Kinacioglu, Department of International Relations, Bilkent, University, Turkey, wrote a response to my article titled, "A Response to Amos Guiora: Reassessing the Parameters of the Use of Force in the Age of Terrorism: Pre-emptive Action and International Law." Tarcisio Gazzini, Faculty of Law, VU University, Amsterdam, also wrote a response titled, "A Response ot Amos Guiora's Article on Pre-Emptive Self-Defence Against Non-State Actors.". (shrink)

In this paper I outline a theory of legitimacy that grounds the state’s right to rule on a natural duty not to harm others. I argue that by refusing to enter the state, anarchists expose those living next to them to the dangers of the state of nature, thereby posing an unjust threat. Since we have a duty not to pose unjust threats to others, anarchists have a duty to leave the state of nature and enter the state. This duty (...) correlates to a claim-right possessed by those living next to them, who also have a right to act in self-defence to enforce this obligation. This argument, if successful, would be particularly attractive, as it provides an account of state legitimacy without importing any normative premises that libertarians would reject. (shrink)

Do individuals have a positive right of self-defence? And if so, what are the limits of this right? Under what conditions does this use of force extend to the defence of others? These are some of the issues explored by Dr Uniacke in this comprehensive 1994 philosophical discussion of the principles relevant to self-defence as a moral and legal justification of homicide. She establishes a unitary right of self-defence and the defence of (...) others, one which grounds the permissibility of the use of necessary and proportionate defensive force against culpable and non-culpable, active and passive, unjust threats. Particular topics discussed include: the nature of moral and legal justification and excuse; natural law justifications of homicide in self-defence; the Principle of Double Effect and the claim that homicide in self-defence is justified as unintended killing; and the question of self-preferential killing. This is a lucid and sophisticated account of the complex notion of justification, revolving around a critical discussion of trends in the law of self-defence. (shrink)

I argue that any successful account of permissible self- defence must be action-guiding, or practical . It must be able to inform people’s deliberation about what they are permitted to do when faced with an apparent threat to their lives. I argue that this forces us to accept that a person can be permitted to use self-defence against Apparent Threats: characters whom a person reasonably, but mistakenly, believes threaten her life. I defend a hybrid account of (...) self-defence that prioritises an agent’s subjective perspective. I argue that it is sufficient to render the use of defence permissible if an agent reasonably believes that (a) she is morally innocent, and (b) if she does not kill this person, then they will kill her. I argue that the correct account of self-defence must distinguish between whether an agent is permitted to inflict harm, and whether the target is liable to bear that harm. (shrink)

I explain the asymmetry between innocent aggressors and their victims, and attempt to separate justified and unjustified defensive force when both parties are innocent. I propose the principle of initiating behaviour, which states that: ‘In order for one person to be justified in using defensive force the other party must initiate the apparently threatening behaviour, but the defendant’s interpretation of that behaviour, as being threatening, would have to be reasonable.’ We can thereby maintain the view that there is a significant (...) relation between an act being justified and which party ought eventually to be given priority in a conflict situation. If we know that an act is justified, we know that we have to give preference to its agent when there is a choice between imposing equal harm on him or her and his or her victim. (shrink)

Do we have the right to defend ourselves against innocent aggressors? If I amattacked in a lift by a knife‐wielding lunatic, may I kill or maim him to protect my own life? On one view the insane man’s plight is his bad luck and I am under no obligation to let it be transferred to me. On the opposing view it is my bad luck to be under attack and I have no right to transfer it to an innocent man (...) by killing him to protect myself. It is perhaps becauseneither of these opposing viewpoints is obviously preferable to the other that there is no consensus about the question. Nevertheless we can find considerations for favouring the first view over the second. (shrink)

I explain the asymmetry between innocent aggressors and their (innocent) victims, and attempt to separate justified and unjustified defensive force when both parties are innocent. I propose the principle of initiating behaviour, which states that: ‘In order for one person to be justified in using defensive force the other party must initiate the apparently threatening behaviour, but the defendant’s interpretation of that behaviour, as being threatening, would have to be reasonable.’ We can thereby maintain the view that there is a (...) significant relation between an act being justified and which party ought eventually to be given priority in a conflict situation. If we know that an act is justified, we know that we have to give preference to its agent when there is a choice between imposing equal harm on him or her and his or her victim. (shrink)

This paper gives a self-defence account of the scope and limits of the justified use of compulsion to control contagious disease. It applies an individualistic model of self-defence for state action and uses it to illuminate the constraints on public health compulsion of proportionality and using the least restrictive alternative. It next shows how a self-defence account should not be rejected on the basis of past abuses. The paper then considers two possible limits to (...) a self-defence justification: compulsion of the non-culpable and over-inclusive compulsion. The paper claims that objections to compelling the non-culpable do not greatly restrict the scope of the self-defence justification. The over-included are, however, innocent bystanders, and methods such as compulsory quarantine, vaccination, and screening are not justified in self-defence. (shrink)

This is the final part of a series of two papers that have examined the conceptual development of the philosophical justifications for tyrannicide. While Part I focused on the classical, medieval, and liberal justifications for tyrannicide, Part II aims to provide the tentative outlines of a contemporary model of tyrannicide in world politics. It is contended that a reinvigorated conception of self-defence, when coupled with the modern understanding of universal human rights, may provide the foundation for the normative (...) validity of tyrannicide in contemporary world politics. (shrink)

The reasonable person standard is used in adjudicating claims of self-defence. In US law, an individual may use defensive force if her beliefs that a threat is imminent and that force is required are beliefs that a reasonable person would have. In English law, it is sufficient that beliefs in imminence and necessity are genuinely held; but the reasonableness of so believing is given an evidential role in establishing the genuineness of the beliefs. There is, of course, much (...) contention over how to spell out when, and in virtue of what, such beliefs are reasonable. In this chapter, we identify some distinctive issues that arise when we consider that implicit racial bias might be implicated in the beliefs in imminence and necessity. Considering two prominent interpretations of the reasonable person standard, we argue that neither is acceptable. On one interpretation, we risk unfairness to the defendant-who may non-culpably harbour bias. On another, the standard embeds racist stereotypes. Whilst there are formulations of the defence that may serve to mitigate these problems, we argue that they cannot be avoided in the presence of racist social structures. (shrink)

ABSTRACT This paper is a reply to three objections raised by Seumas Miller against a ‘forced‐choice’account of the morality of self‐defence. It is argued that Miller's first objection rests on a misconception of how the forced‐choice account is supposed to work; that his second objection is simply mistaken; and that his third objection overlooks how the forced‐choice account explicitly accommodates the moral difference between self‐defence and ‘other‐defence.’Finally, it is suggested that Miller's entire approach is defective (...) in its failure to examine the principle of justice which underlies the forced‐choice account, and whether it applies to standard self‐defence situations. (shrink)

Measures aimed at general deterrence are often thought to be problematic on the basis that they violate the Kantian prohibition against sacrificing the interests of some as a means of securing a greater good. But even if this looks like a weak objection because deterrence can be justified as a form of societal self-defence, such measures may be regarded as problematic for another reason: Harming in self-defence is only justified when it’s necessary, i.e., when there are (...) no relatively harmless alternatives. While there are few harmless ways to remove the threat posed by dangerous individuals, there are many relatively harmless methods for preventing crime. We can bracket off our preventative failings when we think of present threats, but we cannot do so when contemplating alternative preventative measures. (shrink)

The primary method for defending biocentric individualism—a prominent theory of the moral value of organisms—is to appeal to the fact that certain things are good for or bad for living creatures, even if they are not sentient. This defense is typically and frequently met with the objection that we can determine what is good for some living creature without thereby having any moral reason or obligation to promote or avoid undermining it. In this paper I show how a theory of (...) the morality of defensive violence undermines this objection. (shrink)

Do individuals have a positive right of self-defence? And if so, what are the limits of this right? Under what conditions does this use of force extend to the defence of others? These are some of the issues explored by Dr Uniacke in this comprehensive 1994 philosophical discussion of the principles relevant to self-defence as a moral and legal justification of homicide. She establishes a unitary right of self-defence and the defence of (...) others, one which grounds the permissibility of the use of necessary and proportionate defensive force against culpable and non-culpable, active and passive, unjust threats. Particular topics discussed include: the nature of moral and legal justification and excuse; natural law justifications of homicide in self-defence; the Principle of Double Effect and the claim that homicide in self-defence is justified as unintended killing; and the question of self-preferential killing. This is a lucid and sophisticated account of the complex notion of justification, revolving around a critical discussion of trends in the law of self-defence. (shrink)

A provocateur does not pose a threat of harm. Hence, a forceful response to provocation is generally considered wrongful. And yet, a provocateur is often denied recourse to a self-defence justification if she defends herself against such a violent response. In recent work, Kimberly Ferzan argues that a provocateur forfeits defensive rights but this forfeiture cannot be explained in the same way as an aggressor’s rights forfeiture. Ordinarily, one forfeits the right not to be harmed and to (...) class='Hi'>self-defend against harm by threatening to violate another person’s rights. But provocateurs forfeit their defensive rights because they bring about the situation in which defence becomes necessary. As I argue here, positing these two types of forfeiture justifications is neither desirable nor necessary. I suggest a unified rights forfeiture account that grounds rights forfeiture in moral responsibility for an unjust threat. My account offers clearer distinctions than alternative unified accounts, which I briefly discuss. Furthermore, the account can provide better explanations of intuitively plausible judgements. A provocateur will have less extensive defensive rights than an innocent victim, but will not lose all her defensive rights simply because ‘she started it.’. (shrink)

(2011). CHILD SOLDIERS AND KILLING IN SELF-DEFENCE: CHALLENGING THE ‘MORAL VIEW’ ON KILLING IN WAR. Journal of Military Ethics: Vol. 10, No. 1, pp. 36-51. doi: 10.1080/15027570.2011.561639.

abstract During the current round of fighting in the Middle East, Israel has provoked considerable controversy as it turned to targeted killings or assassination to battle militants. While assassination has met with disfavour among traditional observers, commentators have, more recently, sought to justify targeted killings with an appeal to both self‐defence and law enforcement. While each paradigm allows the use of lethal force, they are fundamentally incompatible, the former stipulating moral innocence and the latter demanding the presumption of (...) criminal guilt. Putting aside the paradigm of law enforcement which demands due process and forbids extra‐judicial execution, the only possible avenue for justifying named killings lies in self‐defence. While named killings might be defensible on the grounds that there are no other ways to disable combatants when they fight without uniforms, the costs, including the cost of targeted killing emerging as an acceptable convention in its own right, should be sufficient to view the practice with a good deal of caution. (shrink)

Legal responses to battered women who kill have long animated scholarly debate and law reform activity. In September 2012 after 47 years of alleged abuse, Frenchwoman Jacqueline Sauvage fatally shot her abusive husband three times in the back. The subsequent contested trial, conviction for murder, unsuccessful appeal and later presidential pardon of Sauvage thrust the French law of self-defence into the spotlight. The Sauvage case raises important questions surrounding the adequacy of the French criminal law in this area, (...) the ongoing proliferation of gendered stereotypes in law and the need for reform. In the wake of the Sauvage case, this article provides a timely analysis of the gendered law of self-defence in France. Drawing from an in-depth analysis of the judgments imposed in the Sauvage case, this article examines the adequacy of French legal responses to battered women who kill and ignites an argument for further law reform. (shrink)

ABSTRACTRevisionists about Aquinas’ teaching on private self-defence take the standard reading to hold that Aquinas applies a version of the Doctrine of Double Effect according to which the intentional killing of a wrongful attacker by a private person is morally prohibited while the non-intentional but foreseeable killing of the attacker is permitted. Revisionists dispute this reading and argue that Aquinas permits the intentional killing of wrongful attackers. I argue that revisionists mischaracterize the standard reading of Aquinas. I consider (...) one of its main proponents, Antonio de Córdoba. When Córdoba condemned the intentional killing of wrongful attackers by private persons, he was not applying DDE. Rather, he was arguing that when you decide to kill an attacker you treat the attacker as a resource for the private end of saving your life. Killing a member of your community is a form of irrevocable social exclusion. This decision ought to be left to the public authorities. The disagreement between the authors defending the standard view and their critics was not about DDE but rather about the moral limits that membership in a community sets on the pursuit of private ends, including the private end of staying alive. (shrink)

Helen Frowe has recently offered what she calls a “practical” account of self-defense. Her account is supposed to be practical by being subjectivist about permissibility and objectivist about liability. I shall argue here that Frowe first makes up a problem that does not exist and then fails to solve it. To wit, her claim that objectivist accounts of permissibility cannot be action-guiding is wrong; and her own account of permissibility actually retains an objectivist (in the relevant sense) element. In (...) addition, her attempt to restrict subjectivism primarily to “urgent” situations like self-defense contradicts her own point of departure and is either incoherent or futile. Finally, the only actual whole-heartedly objectivist account she criticizes is an easy target; while those objectivist accounts one finds in certain Western European jurisdictions are immune to her criticisms. Those accounts are also clearly superior to hers in terms of action-guidingness. (shrink)

Drawing on the historical insight of Emer de Vattel to build on the contemporary arguments of Michael Walzer and David Luban, this article develops a model of sufficient risk as a necessary condition for anticipatory war to be deemed self-defence. This model holds that an anticipatory war may constitute legitimate self-defence (as opposed to aggression) when it aims to forestall a threat that poses a sufficient risk to the anticipating state. This is the point where a (...) threat is both sufficiently likely to materialise and sufficiently large to pose a grave risk. Due to crucial problems with the imminence condition for self-defence, I propose that the sufficient risk condition subsume that of imminence. The power of this model lies in its ability to encapsulate all factors raised by previous authors that are morally relevant specifically for anticipatory wars and categorise them as contributing to the judgement of the likelihood of the threat materialising and/or the magnitude of the potential threat. This parsimonious categorisation increases the accuracy and clarity of the moral theory on anticipatory war, making it more robust to change in the types of threats faced by states, and less ripe for manipulation to justify immoral wars. (shrink)

Among the most elementary of moral truisms is the principle of universality: we apply to ourselves the same standards we do to others, more stringent ones if we are serious. A near-universal principle of intellectual culture is the rejection of this truism, sometimes explicitly. Rejection of this and similar moral truisms has severe human consequences, and yields what are regarded as “hard problems”—hard in no small measure because truisms are rejected. Illustrations range from establishment of “norms” for international behavior to (...) practice and doctrine with regard. Footnotes1 Talk at Royal Institute of Philosophy, London, May 19, 2004. (shrink)

‘pedibus makes no better sense than metre.’ Shackleton Bailey, who suspects an allusion to the exclusus amator theme and accordingly suggests unctis…postibus . But iunctis pedibus is idiomatic Latin for an all-out fight and has an authentic look to it; Ovid, Met. 9. 42–4 illustrates the usage: rursusque ad bella coimus inque gradu stetimus certi non cedere, eratque cum pede pes iunctus. See further Verg. A. 10. 361 haeret pede pes densusque viro vir; Liv. 38. 21. 13 pede collato pugnandum (...) est; Sil. 4. 352–53 teritur iunctis umbonibus umbo, pesque pedem permit; Ov. Am. 1. 4. 44 nec tenerum duro cum pede iunge pedem. However, ‘Stand up to your wife, Cresciturus, and fight’ will not do. That would be a humourless piece of advice and, in any event, Cresciturus appears to be too henpecked to act on it. Since he cannot fight with fair means, he must resort to foul. pēdibus is neither corruption nor false quantity, but a comic coinage: pēs, pēdis, from pēdo , on the analogy of pēs, pĕdis, ‘foot’: Cresciture, si non vis vapulare, coniugi iterum atque iterum oppedas necesse est. Dorsa in the first verse calls attention to the fact that Cresciturus enjoys a strategic position for such a manoeuvre – a position which is the very reverse of iunctis pĕdibus in its normal sense. In short, iunctis…pēdibus is a παρ προσδοκαν for iunctis…pĕdibus. (shrink)

The problem of moral sunk costs pervades decision-making with respect to war. In the terms of just war theory, it may seem that incurring a large moral cost results in permissiveness: if a just goal may be reached at a small cost beyond that which was deemed proportionate at the outset of war, how can it be reasonable to require cessation? On this view, moral costs already expended could have major implications for the ethics of conflict termination. Discussion of sunk (...) costs in moral theorizing about war has settled into four camps: Quota, Prospect, Addition, and Discount. In this paper, I offer a mathematical model that articulates each of these views. The purpose of the mathematisation is threefold. First, to unify the sunk costs problem. Second, to show that these views differ in the nature of their justifications: some are justified qualitatively and others quantitatively. Third, to clarify the differential force of qualitative and quantitative critiques of these four views. (shrink)