In Chapters 4 and 5 of his 1998 book From Metaphysics to Ethics: A Defence of Conceptual Analysis, Frank Jackson propounds and defends a form of moral realism that he calls both ‘moral functionalism’ and ‘analytical descriptivism’. Here we argue that this metaethical position, which we will henceforth call ‘analytical moral functionalism’, is untenable. We do so by applying a generic thought-experimental deconstructive recipe that we have used before against other views that posit moral properties and identify them with certain (...) natural properties, a recipe that we believe is applicable to virtually any metaphysically naturalist version of moral realism. The recipe deploys a scenario we call Moral Twin Earth. (shrink)

Jackson and Pettit propose a "functionalist" analysis of evaluative content in service of a naturalistic reduction of moral terms. Though a broadly functionalist account may be correct, it does not immediately lead to a naturalistic theory for two reasons. First, a naturalistic theory should make clear in what sense the properties in question are naturalistic. The paper raises some doubts that this can be done consistent with the functionalist reduction. Second, even if we can construct true Ramsey sentences containing only (...) naturalistic vocabulary and variables for moral terms, this will not ensure that the satisfiers for those variables are naturalistic. (shrink)

I argue against the analytic moral functionalist view propounded by Frank Jackson and Philip Pettit. I focus on the ‘input’ clauses of our alleged ‘folk moral theory’. I argue that the examples they give of such input clauses cannot plausibly be interpreted as analytic truths. They are in fact substantive moral claims about the moral ‘domain’. It is a substantive claim that all human beings have equal moral standing. There are those who have rejected this, such as Herman Göring. He (...) was loyal to a sub-class of humankind, but he suffered no conceptual confusion. Claims about what is morally relevant are substantive claims that cannot be known on purely conceptual grounds. (shrink)