engaged in self-contradiction

Even those who deny moral absolutes have at least one moral absolute: "You should not believe there are moral absolutes. You should believe there is morality." In effect, they contradictorily have a morality about no morality They say you should ("should" entails moral obligation or duty) believe there are no moral absolutes. This is illustrated by the ethics professor committed to moral relativism and denying moral absolutes, who will absolutely demand that his students not cheat on his exams.

This is the moral point of view of fallen man. As you have learned from worldview analysis, worldviews necessarily involve metaphysical, epistemological, and ethical considerations. Therefore, the reason that those who demand no moral absolutes are engaged in self-contradiction is because moral absolutes are inescapable.

Greg L. Bahnsen, Pushing the Antithesis: the apologetic methodology of Greg L. Bahnsen, (Powder Springs, GA: American Vision, 2007), 173.