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of occurring—a success rate of more than 90%. And subjects onoxytocin? The majority made this absurd claim.What's going on? Maybe the subjects on oxytocin anticipated that theirteammates would cheat more and followed suit. But oxytocin didn't affectpeople's estimates of their teammates' cheating rates.Maybe they cheated more out of self-interest. After all, more money forthe team meant more for the individual. But no—when people played thegame solely for their own gain, oxytocin had no effect. It was about thegroup, stealing from the outsider who was supplying the money. In thefield's jargon, oxytocin enhances "parochial altruism." 27Does parochial altruism happen in the real world? As Dan Ariely of Duke University hasnoted, one reason we cheat is “because we are good people who care about thewelfare of those around us.” 28Think of Robin Hood, and others who rationalize theirbad behavior – theft masquerading as charity for a group they believe to be deserving.If parochial altruism were only about lies and petty theft, it would be bad enough, but ourtribal instincts can turn far uglier than that. Kevin Dutton notes there is an “insidiousconnection between group identity and violence,” and he illustrates the point with a story27 Sapolsky, supra note 12.28 Daniel Ariely, The (Honest) Truth About Dishonesty 232 (2012).10