Ethical relativism holds that there are no objective moral standards and that right and wrong are defined by cultural and individual perspectives. Relativists argue that moral diversity and uncertainty across cultures and situations show the lack of universal standards. However, critics argue that moral diversity does not necessarily mean an absence of shared principles, and uncertainty in deciding right from wrong does not imply its nonexistence. Relativism is also said to promote tolerance, but forcing acceptance of all practices risks discomfort and prevents questioning customs, including one's own.