You're right, it sounds completely crazy to me. Nobody really bombed or shot Timothy McVeigh. Or the RAF. Or the Brigate Rosse. They did all their shooting and bombing all by themselves, at the cost of hundreds upon hundreds of innocent lives. It's not that the questions of causes or morality of our own actions are illegitimate - they aren't. The idea that we're going to practically stop amoral nutjobs by just being ever so much nicer seems based on nothing but wishful thinking, though.