I was thinking, good and evil are very fine lines.
Consider the dwarfs and the elves. Both are good, noble races, interested in keeping their own affairs. But bad stuff happens and they each accuse the other of being evil and comitting crimes against them. If you took up the dwarfs side, the elves would see you as a colaborator of evil. The dwarfs, on the other hand, would see you as a champion of the forces of good.
Good and evil is subjective. I think the guy that wants to cut off my phone is evil, even though I'm sure he's just a good person doing his job.