The Benacerraf challenge is a well-known objection to Platonism in mathematics. Its proponent argues that, if mathematical entities are, as Platonists claim, mind-independent, causally inert, and existent beyond space and time, then we are led to a skeptical stance according to which it is not possible to explain how it is that we have cognitive access to the mathematical realm or how it is that our mathematical beliefs are reliable. It has been argued that a similar objection could be leveled (...) against those forms of moral realism that fall under what in Section 2 was called “robust moral realism.” In “Moral Skepticism and the Benacerraf Challenge,” Folke Tersman considers whether, unlike the argument from the best explanation, the argument from disagreement, and the argument from evolution, the moral version of the Benacerraf challenge can undermine moral knowledge without appealing to empirical claims that moral realists deem controversial. His verdict is negative: to successfully counter certain responses to the moral version of the challenge, its proponent needs to have recourse to empirical considerations taken from some of the above arguments. (shrink)

The fact that debunkers can turn to the argument from disagreement for help is ofcourse not a surprise. After all, both types of challenge basically pursue the same,skeptical conclusion. What I have tried to show, however, is that they are related in amore intimate way.

I argue that information about the distal causes of moral beliefs, such as evolution, is only relevant for assessing the epistemic status of moral beliefs in cases where we cannot determine whether the proximal processes producing these beliefs are reliable just by examining the properties of these proximal processes. Any investigation into the epistemic status of moral beliefs given their causes should start with a look at proximal causes—not at evolution. I discuss two proximal psychological influences on moral beliefs—disgust and (...) sympathy—to demonstrate the feasibility of drawing epistemic conclusions from an examination of proximal causes alone. (shrink)