I don’t have to be told something is evil if I can see it. The gnoll making tents out of people-flesh, when they’re sentient enough to know this is a Bad Thing and Not To Do It - that’s an evil act.
The murlocs just living their life in the nearby pond? Yeah, y’know, I can feel a bit bad about killing them.
The massive death-dragon attempting to destroy the entire world? Y’know. Probably evil, or at least I have a pragmatic reason to kill that guy.
The lowbie Alliance warrior just trying to level? I’mma leave that guy alone, he’s got enough to worry about.
The selfish corpse seeking to extend their own lifespan by using those that trust it as shields and casting them away as soon as she gets an ‘upgrade’ of alliances? Yeah, it’s going down.