but while I suspect you may disagree, most people seem to think human ethics are not mutually contradictory and are, in fact, part of the psychological unity of humankind (most include caveats for psychopaths, political enemies, and those possessed by demons.)

As a bonus, the exception class of "enemies" and "immoral monsters" tends to be contrived to include anyone who has a sufficient degree of difference in ethical preferences. All True humans are ethically united...