Moral relativism is enticing. It enables me to establish the moral value of everything I do by reference to the behavior of others. It allows me to avoid censure by judging my intentions, choices and actions not on the basis of whether they are intrinsically right or wrong, but by the lesser standard of whether someone in a similar position might have done something similar. It is deeply corrosive of personal mores and social trust. Over time it dulls the conscience to any moral hierarchy. It is never a legal defense and shouldn’t be a moral one. Moral relativism is...