  The error theorists’ position regarding morality is the counterpart, with respect to moral thought, of the atheist's position with respect to views concerning God's will and ways. In both cases, the suggestion is that the thoughts at issue involve a mistake or a failed presupposition, and that, because of this, they cannot be true. The error theorist's position, it is worth noting, requires establishing two claims that have each met a lot of resistance: that moral thought really has the presuppositions the error theorist supposes and that those presuppositions are as untenable as the error theorist maintains. At the same time, though, anyone who hopes to vindicate moral thought has the burden of showing that its actual presuppositions and implications are, after all, defensible.