Ingram (2015) has argued that Cuneo and Shafer-Landau’s (2014) ‘moral fixed points’ theory entails that error theorists are conceptually deficient with moral concepts. They are conceptually deficient with moral concepts because they do not grasp moral fixed points (e.g. ‘Torture for fun is pro tanto wrong’). Ingram (2015) concluded that moral fixed points theory cannot substantiate the conceptual deficiency charge and, therefore, the theory is defeated. In defense of moral fixed points theory, Kyriacou (2017a) argued that the theory is coherent (...) with the error theorists being conceptually competent with moral concepts, while reflectively denying moral fixed points theory. This is because error theorists could be conceptually competent with moral concepts but, due to intellectual vices, be swayed by unsound arguments against moral fixed points theory. Ingram (2018) replied to Kyriacou (2017a) that the intellectual vice charge against error theorists cannot be substantiated and, therefore, the moral fixed points theory is still defeated. In this paper, I argue that the possibility of intellectual vice is independently plausible and sufficient to undermine Ingram’s argument against the moral fixed points theory. (shrink)