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. · Go to Why we cele­brate killing Bin Laden →