Sorry, who’s the serial killer and who’s the soldier in this equation? I don't plan on going out and killing anyone, but I don’t see what’s wrong with thinking

Sorry, who’s the serial killer and who’s the soldier in this equation? I don't plan on going out and killing anyone, but I don’t see what’s wrong with thinking it’s good if it happens to certain very bad people. I suspect you have some people you’d think that of too. Maybe not, but most people do. Since I’m not acting on it, my judgment counts for essentially nothing. I don’t understand this strong reaction to it.