And you can see why natural selection would have made righteous rage attractive: in a small hunter-gatherer village, if someone took advantage of you—stole your food, stole your mate, or just generally treated you like dirt—you needed to teach him a lesson. After all, if he learns he can get away with abusing you, he may do it again and again. Worse still, others in your social universe will see that you can be thus exploited, so they
