Objection: Disgust, Morality, and the Law

Why do we consider incest wrong, even when it occurs between consenting adults unable to have children? Why are words that gross us out more likely to be deemed "obscene" and denied the protection of the First Amendment? In a world where a gruesome photograph can decisively influence a jury and homosexual behavior is still condemned by some as "unnatural," it is worth asking: is our legal system really governed by the power of reason? Or do we allow a primitive human emotion, disgust, to gu...