For the purposes of the game most of normal morality is abandoned in alignment. Evil is basically anyone who kills indiscriminately, for their personal gain or the furthering of a cause. Neutral should care from time to time, understand whatever role relevant circumstances, who they're killing- otherwise they can arguably do what they please. Good never or almost never kills good, beyond race/cabal/religion- things with (Gold Aura) just plain don't attack or deliberately harm other (Gold Aura)s.
So, that really the range of things you can do as an evil essentially unlimited. Whatever ethos or motto or creed or religion or lifestyle and what it asks them to do, your evil can justify it to themselves no problem. I have a favorite saying, that comes from some epic source I've totally forgotten: The road to hell is paved with good intentions.