Good and Evil, if such concepts exist, assumes a divine law external to the human social matrix; otherwise, we are only discussing psychological convenience vs. inconvenience due to biologic urges.

One need not turn to the Nazis for questions of benefits from immoral behaviors and policies upon which our human society is built. That we exist today necessarily means that our forebears offed some other poor sucker to pass on their genetic legacy. One could argue that the luxury of ethical hypotheticals are accorded only to the vicious, as those who could not be as vicious are fertilizing our wheat and rice fields today.

The genocidal wars against "natives" of Americas allowed for US dominated Western capitalism. The Visigoth sacking of effete Rome allowed for Europe to exist as it does today. The genocide of Carthaginians allowed for Roman legal conventions and imperial model to shape Europe. It is not by coincidence that the Bible speaks of cities, i.e. human civilization, arising as a result of first murder; or the Sumerians speak of both the gifts and curse of civilization that cannot be segregated; or Plato speaks of "Noble Lie" that must underlie a "just" city. Human civilization, by necessity, has foundation on human miseries.