Online research in philosophy

It is an assumption common to many theories of rationality that all practical reasons are based on a person's given desires. I shall call any approach to practical reasons which accepts this assumption a "Humean approach". In spite of many criticisms, the Humean approach has numerous followers who take it to be the natural and inevitable view of practical reason. I will develop an argument against the Humean view aiming to explain its appeal, as well as to expose its mistake. I focus on just one argument in favour of the Humean approach, which I believe can be constructed as the background idea of many Humean accounts: the argument from motivation.

The Humean theory of motivation remains the default position in much of the contemporary literature in meta-ethics, moral psychology, and action theory. Yet despite its widespread support, the theory is implausible as a view about what motivates agents to act. More specifically, my reasons for dissatisfaction with the Humean theory stem from its incompatibility with what I take to be a compelling model of the role of motivating reasons in first-person practical deliberation and third-person action explanations. So after first introducing some assumptions about the nature of agency in section one, I will turn to articulating and defending this account of motivating reasons in sections two through four of the paper. Section five then provides some background on the Humean theory before I argue directly against it in section six and critically examine the leading arguments for the view in section seven. Given limitations of space, however, I save the task of developing a positive anti-Humean view for another occasion.

Long claimed to be the dominant conception of practical reason, the Humean theory that reasons for action are instrumental, or explained by desires, is the basis for a range of worries about the objective prescriptivity of morality. As a result, it has come under intense attack in recent decades. A wide variety of arguments have been advanced which purport to show that it is false, or surprisingly, even that it is incoherent. Slaves of the Passions aims to set the record straight, by advancing a version of the Humean theory of reasons which withstands this sophisticated array of objections. Schroeder defends a radical new view which, if correct, means that the commitments of the Humean theory have been widely misunderstood. Along the way, he raises and addresses questions about the fundamental structure of reasons, the nature of normative explanations, the aims of and challenges facing reductive views in metaethics, the weight of reasons, the nature of desire, moral epistemology, and most importantly, the relationship between agent-relational and agent-neutral reasons for action.

Michael Smith's recent defence of the theory shows promise, in that it captures the most common reasons for accepting a Humean view. But, as I will argue, it falls short of vindicating the view. Smith's argument fails, because it ignores the role of rationality conditions on the ascription of motivating reason explanations. Because of these conditions, we must have a theory of rationality before we choose a theory of motivation. Thus, we cannot use Humean restrictions on motivation to argue for a particular conception of rationality. I will not directly criticize using a Humean conception of rationality to defend a Humean theory of motivation. For my argument implies that such criticism must come more directly, as argument over the substantive content of rationality.

To the extent, then, that we set our face against admitting the truth of Humeanism in the theory of motivation, to that extent we are probably going to feel that there is no such thing as the theory of motivation, so conceived, at all. And that will be the position that this paper is trying to defend, though not only for this reason. It might seem miraculous that so much can be extracted from the little distinction with which we started, between the reasons why an action was right and the agent's reasons for doing it. It is not so much the distinction itself which is the culprit, however, as the account of it that sees motivating reasons as complexes of beliefs and desires, i.e. as complexes of psychological states of whatever sort, and sees justifying reasons as truths. It is this account, which puts into form the attempt to combine value realism with Humean philosophical psychology, that leads to the results I have outlined above.

This paper addresses the two extensional objections to the Humean Theory of Reasons—that it allows for too many reasons, and that it allows for too few. Although I won’t argue so here, manyof the other objections to the Humean Theoryof Reasons turn on assuming that it cannot successfully deal with these two objections.1 What I will argue, is that the force of the too many and the too few objections to the Humean Theorydepend on whether we assume that Humeans are committed to a thesis about the weight of reasons—one I call Proportionalism. In particular, I’ll show how a version of the Humean Theorythat rejects Proportionalism can reasonablyhope to escape both the too many and the too few objections. This will constitute my defense of this version of the Humean Theory. But then, separately, I will argue that this defense of the Humean Theoryis not ad hoc. I’ll argue that Humeans have no reason to accept Proportionalism in the first place. Or at least, no weightyone. There are three parts to the paper. In Part 1 we introduce the Humean Theoryand the too few reasons objection. I’ll first layout the objection, and then layout the basis for a response on behalf of myfavored version of the Humean Theory. There will be an obvious objection to my defense— but it will turn out to depend on the assumption of Proportionalism. This will constitute myargument that the susceptibilityof the Humean Theoryto..

Realists about practical reasons agree that judgments regarding reasons are beliefs. They disagree, however, over the question of how such beliefs motivate rational action. Some adopt a Humean conception of motivation, according to which beliefs about reasons must combine with independently existing desires in order to motivate rational action; others adopt an anti-Humean view, according to which beliefs can motivate rational action in their own right, either directly or by giving rise to a new desire that in turn motivates the action. I argue that the realist who adopts a Humean model for explaining rational action will have a difficult time giving a plausible account of the role that desire plays in this explanation. I explore four interpretations of this role and argue that none allows a Humean theory to explain rational action as convincingly as an anti-Humean theory does. The first two models, in different ways, make acting on a reason impossible. The third allows this possibility, but only by positing a reason-sensitive desire that itself demands an explanation. The fourth avoids this explanatory challenge only by retreating to an empty form of the Humean view. In contrast, an anti-Humean theory can provide an intuitively plausible explanation of rational action. I conclude that the realist about reasons should adopt an anti-Humean theory to explain rational action.

The Humean internalist finds Humean motivational theses and reasons internalism to be independently attractive. She therefore combines them, in the hope of creating a theory of reasons that is attractive for all of the reasons that each thesis is attractive. On this score, she succeeds. However, there is a drawback. Those who build a theory of reasons by combining Humean motivational theses and reasons internalism face a dilemma. If you combine these views, either you are committed to a theory of reasons that allows all of a person’s reasons to simultaneously change, erratically and randomly, or you are committed to a theory of reasons that fixes a person’s reasons at birth, in which case they remain stable and unchanging over a lifetime. Neither alternative is attractive. Humean internalism cannot navigate a path between these two extremes, and this should worry the Humean internalist.

In his recent book Slaves of the Passions , Mark Schroeder defends a Humean account of practical reasons ( hypotheticalism ). He argues that it is compatible with 'genuinely agent-neutral reasons'. These are reasons that any agent whatsoever has. According to Schroeder, they may well include moral reasons. Furthermore, he proposes a novel account of a reason's weight, which is supposed to vindicate the claim that agent-neutral reasons ( if they exist), would be weighty irrespective of anyone's desires. If the argument is successful, it could help avoid an error-theory of moral language. I argue that it isn't, and that we should reject a Humean approach to reasons.

When we have a normative reason, and we act for that reason, it becomes our motivating reason. But we can have either kind of reason without having the other. Thus, if I jump into the canal, my motivating reason was provided by my belief; but I had no normative reason to jump. I merely thought I did. And, if I failed to notice that the canal was frozen, I had a reason not to jump that, because it was unknown to me, did not motivate me. Though we can have normative reasons without being motivated, and vice versa, such reasons are closely related to our motivation. There are, however, very different views about what this relation is. This disagreement raises wider questions about what normative reasons are, and about which reasons there are. After sketching some of these views, I shall discuss some arguments by Williams, and then say where, in my opinion, the truth lies. [...] I [will] suggest why, as I believe, we should be non-reductive normative realists, and should regard all reasons as external.