I get black and white thinking all the time. I believe its part of my autism though. Something either is or isn't, good or bad, up or down with no shades of gray. I am called an extreme thinker. It even is part of a financial situation, I believe either (when manic) that we are going to make millions upon millions of dollars or while depressed I believe we are going to lose everything we own and talk to talking rats on the streets. The same with good or evil. I don't think people are in between those two, they are good if they commit no crimes and doesn't lie or if you do commit crimes or do other stupid things like lie all the time I believe they are evil.