In this chapter I provide a more detailed account of the kind of moral necessities and impossibilities that I have alluded to, with reference to Winch, in Chapter 3. More precisely, I consider how we are to distinguish those cases where an agent’s claimthat they cannot (or perhaps cannot avoid acting) in some way expresses, as I will argue, a genuine moral judgement, from other cases where it expresses what I call mere psychological incapacity. The central argument of this chapter emerges in large part through my response to, and ultimate rejection of, Bernard Williams recent account of this distinction in his paper `Moral Incapacity’.1
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