Morality is relative, not absolute. The standard is determinate by the society, subjectively.
In which case it is a meaningless term. There is only social convenience and personal preference. And no given individual is bound by either. IN this case there is not rational reason for being "good" other than the fear of punishment. If this is true then there are only two commandments (1) Do as thou wilt; and (2) don't get caught. If this is true than there is no objective basis for saying HItler was "bad" or "evil".