Rachels finds the idea of moral progress to be incompatible with cultural relativism.

Question

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Cultural relativism posits that moral or ethical systems, which vary from culture to culture, are all equally valid and no one system is really "better" than any other. This is because cultural relativism holds that each culture's beliefs are right within that culture. Therefore, if one adheres strictly to cultural relativism, the concept of moral progress (which implies some moral or ethical systems are better or more advanced than others) becomes incompatible, as it suggests a universal standard by which such progress could be measured.

Rachels Finds the Idea of Moral Progress to Be Incompatible