" Violence is the easiest and the hardest thing in the world to understand. Some of us are prepared to use it to get power, others only in self-defense, some all the time, others not at all. But then there's another type, unlike all the others, who seems to fight entirely without purpose. Ask anyone who has looked into a pair of those eyes when they turn dark, and you'll realize that we belong to different species. No one can really know if those people lack something that other people possess or if it's the other way around. If something goes out inside them when they clench their fists or if something switches on. "

― Fredrik Backman , Us Against You (Beartown, #2)