In contrast, it is by no means clear why mental properties would weakly supervene on physical properties without strongly supervening on them; and the analogous question arises for moral properties and nonmoral properties. Davidson and Hare owe us an explanation of why mental and moral properties weakly supervene, respectively, on physical and nonmoral ones—and it must be an explanation that does not entail that strong supervenience holds as well. Simon Blackburn’s well-known argument against mo