>The concept of “good and evil” are relative to the audience and power structure.

Right. But I wouldn't call it a concept. Theres really nothing to conceptualize here except for "finding a way to leave more descendants than your competition". I suppose you could call that evil, but we do that everyday. By eating a cow you're doing that. And, in fairness, you will find your share of people that call that evil.

This leads me to believe that "evil" doesn't truly exist except as a convienent word to use when something really disgusts us.