I think evil has a lot to do with intention rather than action. For that reason, I believe there are very few evil people in the world. Maybe I'm too trusting, but I think that the majority of people do whatever it is they are doing because they believe in it. They believe it will be good on some level.

I just can't (won't?) accept that most people would do terrible things just to be terrible. Then again, there is an entire internet of trolls waiting to prove me wrong. :-/