  Tolhurst presents an argument whose conclusion is that no moral beliefs are ever justified, if those beliefs are understood “on the realist model” (610). Its premises include two epistemic principles which together imply that if a person’s belief that P is justified, then it is not possible for there to be another person who is similar in all epistemically relevant respects and who believes not-P. A further premise is that, for every person a and every moral claim M which is accepted by a, it is indeed possible for there to be another person who shares a’s non-moral beliefs, is equally good at reasoning and is (therefore) similar in all relevant respects, and yet believes the negation of M. Given that further premise, it follows that no moral belief is justified. As indicated, Tolhurst takes this argument to be conditional on a realist understanding of moral beliefs. However, the premises make no mention of that assumption, and Tolhurst does not elaborate on how it would help a non-skeptic to adopt an alternative  account.[5]