From Jonathan Haidt in NY Times: You can’t just scale up your ideas about morality at the individual level and apply them to groups and nations. If you do, you’ll miss all that was good, healthy and even altruistic about last week’s celebrations. Here’s why. For the last 50 years, many evolutionary biologists have told us that we are little different from other primates — we’re selfish creatures, able to act altruistically only when it will benefit our kin or our future selves. But in the last few years there’s been a growing recognition that humans, far more than other primates, were shaped by natural selection acting at two different levels simultaneously. There’s the lower level at which individuals compete relentlessly with other individuals within their own groups. This competition rewards selfishness.