According to James Rachels,
Cultural Relativism, as it has been called, challenges our ordinary belief in the objectivity and universality of moral truth. It says, in effect, that there is no such thing as universal truth in ethics; there are only the various cultural codes, and nothing more. Moreover, our own code has no special status; it is merely one among many.
Rachels is a critic of Cultural Relativism (CR). He points out that if CR were true, Americans, living by our different moral codes, could not rationally criticize widely accepted cultural practices such as slavery, anti-Semitism, genital mutilation, racism, denying women the right to vote, or discrimination against LGBT people. According to CR, the rightness or wrongness of such cultural codes can only be judged relative to the codes or norms of the culture in which such practices are embedded: there is no coherent or meaningful transcultural perspective that would justify a claim that such practices are objectively wrong....
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