I think a lot of human progress consists of overcoming certain instincts, and understanding that just because someone wants something different from you, it doesn’t mean that they’re bad or that causing them harm is morally acceptable. But more important, in most cases it also doesn’t mean that you’ll be better off by hurting them. It’s so, so easy to mistake damage to your enemy as a personal gain. This happens on every level: among friends, at work, and in politics.