This is a great post. I just want to add: we might fail to understand physics and mass murderers for different reasons. When a terrorist slams a jet into a skyscraper, someone can say “I don’t understand why that person did that? It’s bizarre.” But they seem to fail in understand because victims have a biased recall of transgressions (according to the work by Baumeister on the myth of pure evil). Perpetrators seem to actually have more accurate and complete understandings of transgressions. This is one of my favorite findings from social science.
In contrast, we seem to think physics is bizarre for different reasons.