"There is a huge appeal, and I try to show this in the Potter books, to black and white thinking. It's the easiest place to be and in many ways it's the safest place to be. If you take an all-or-nothing position on anything, you will definitely find comrades, you will easily find a community. "I’ve sworn allegiance to this one simple idea." What I've tried to show in the Potter books, and what I feel strongly myself, is that we should mistrust ourselves most when we are certain."