The moral error theorist holds that moral discourse is guilty of a systematic error. Thus, no positive first-order moral claims can be true. Although there are strong reasons in favour of the moral error theory, it seems like it might carry devastating implications for our moral practice. In particular, there is the very real possibility that adopting a moral error theory could lead to the loss of the desirable practical goods that our moral practices deliver. Central among these goods is the capacity of moral considerations to facilitate (i) a way to solve so-called commitment problems, and(ii) beneficial and progressive social change. In this paper, I look at the extent to which a moral error theory threatens (i) and (ii) by drawing upon relevant findings from moral and cognitive psychology.