A study of moral customs, convictions, and motivations. A domain of anthropology, sociology, and psychology. If she cannot do a , then it is not obligatory for her to do a . A moral code must not provide incompatible prescriptions for any situation.
All killings are morally wrong.
Charles Manson killed several people. Thus, CM did something morally wrong. All killings are morally wrong. A fisherman killed a fish. Thus, a fisherman did something morally wrong.