"Being Wrong: Adventures in the Margin of Error" by Kathryn Schulz. I especially loved the bit where she explained that if people see things differently, we 1) think they are uninformed. If we know they are informed, we think 2) they are stupid. If we know they aren't stupid, we decide 3) they are evil.

I also read another great book that talked about differences between conservative, liberal, and libertarian viewpoints, with a notion of different taste buds that are active when observing the world that was really interesting, but unfortunately, the name escapes me.