Film director Michael Haneke says:
There is just as much evil in all of us as there is good... We're all continuously guilty, even if we're not doing it intentionally to be evil. Here we are sitting in luxury hotels, living it up on the the backs of others in the third world. We all have a guilty conscience, but we do very little about it.
I'd say that rather flattens out the concept of evil and renders it less than useful. The potentiality for evil may inhere in many people but one shouldn't just take it as read that it is present in all, and one shouldn't accept, either, that there is as much evil in all of us as there is good, or that there is as much evil in some of us as in others of us. It makes a difference what people do, how they actually behave, and if they behave well then their capacity to do evil in certain circumstances doesn't quite count in the same way as if they had done it. Not everyone is continuously guilty for everything, or else being guilty loses its meaning. Staying in a hotel, even a luxury hotel, doesn't in itself make a person responsible for all the wrongs in the third world, or anywhere else for that matter. Most people with good lives could do more to help others than they do, but that's something different.