School shootings, parent shootings by kids -- where do they come from? These repeated instances of people in rural towns trying to find someone to kill their spouse. It feels like that sort of crime needs a long leadup, a whole history of progressive violence. But sometimes there doesn't seem to be that history. People just get this idea and go do it, because they can't think of anything else to do, maybe. And the neighbors always say the murderers were nice, polite, normal. What is it that is built up in some people that makes killing unthinkable, that in others is absent, so killing is just one more option. And how widespread is the absence of insides in people? And how can one know whether one has insides, oneself?