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Moral relativism is the view that moral judgments are true or false only relative to some particular standpoint (for instance, that of a culture or a historical period) and that no standpoint is uniquely privileged over all others. It has often been associated with other claims about morality: notably, the thesis that different cultures often exhibit radically different moral values; the denial that there are universal moral values shared by every human society; and the insistence that we should refrain from passing moral judgments on beliefs and practices characteristic of cultures other than our own.
Relativistic views of morality first found expression in 5th century B.C.E. Greece, but they remained largely dormant until the 19th and 20th centuries. During this time, a number of factors converged to make moral relativism appear plausible. These included a new appreciation of cultural diversity prompted by anthropological discoveries; the declining importance of religion in modernized societies; an increasingly critical attitude toward colonialism and its assumption of moral superiority over the colonized societies; and growing skepticism toward any form of moral objectivism, given the difficulty of proving value judgments the way one proves factual claims.
For some, moral relativism, which relativizes the truth of moral claims, follows logically from a broader cognitive relativism that relativizes truth in general. Many moral relativists, however, take the fact-value distinction to be fundamental. A common, albeit negative, reason for embracing moral relativism is simply the perceived untenability of moral objectivism: every attempt to establish a single, objectively valid and universally binding set of moral principles runs up against formidable objections. A more positive argument sometimes advanced in defense of moral relativism is that it promotes tolerance since it encourages us to understand other cultures on their own terms.
Critics claim that relativists typically exaggerate the degree of diversity among cultures since superficial differences often mask underlying shared agreements. In fact, some say that there is a core set of universal values that any human culture must endorse if it is to flourish. Moral relativists are also accused of inconsistently claiming that there are no universal moral norms while appealing to a principle of tolerance as a universal norm. In the eyes of many critics, though, the most serious objection to moral relativism is that it implies the pernicious consequence that “anything goes”: slavery is just according to the norms of a slave society; sexist practices are right according to the values of a sexist culture. Without some sort of non-relative standard to appeal to, the critics argue, we have no basis for critical moral appraisals of our own culture’s conventions, or for judging one society to be better than another. Naturally, most moral relativists typically reject the assumption that such judgments require a non-relativistic foundation.