I really believe that all of us have a lot of darkness in our souls. Anger, rage, fear, sadness. I don't think that's only reserved for people who have horrible upbringings. I think it really exists and is part of the human condition. I think in the course of your life you figure out ways to deal with that.
My motivation is to get a deeper understanding and exploration of something that I want to know about the human condition. So, that's what I look for in the material I read: if it's asking a genuine question about a concept of the world that interests me. And also, it helps if it's a context that I find interesting.