Dooley's thesis is pretty unremarkable. People who hold the view that they are superior by virtue of their race, culture or religion need to be disabused of that notion or the notion will propagate. What made Germany and Japan into the pacifist allies of the US they now are? Engagement? Diplomacy? Nope. You kill enough of them and break enough of their stuff so that those who remain realize their ideology is a loser.