[TraineeHuman]

Good and evil simply have no relationship to each other. Let me suggest that trying to compare them is a little like wanting to compare the number two with the color blue. .
As previous posts seem to imply, it's probably easier to look at something more concrete, like "harm" rather than "evil". Do no harm. Or else, if harm seems unavoidable, do minimal harm. Or else, if even that isn't possible because you're constrained by power somebody else is exerting, be as creative as practicable with the situation, and also, if practicable, work on trying to change the arrangements. That's the ethical principle all social workers, psychologists, nurses, doctors, etc, are required to follow.

But how can we be sure we're not doing harm? And of course, power is so addictive that people tend to let it take them over and blind them. I'd like to suggest you or I may not necessarily have done better than Hitler, or Genghis Khan, or whoever, if you or I had been put into a position like theirs.