In another study, while oxytocin made team members more cooperative in a competitive game, as expected, it made them more preemptively aggressive to opponents. The hormone even enhances gloating over strangers’ bad luck.[16] Thus, the hormone makes us nicer, more generous, empathic, trusting, loving . . . to people who count as an Us. But if it is a Them, who looks, speaks, eats, prays, loves differently than we do, forget singing “Kumbaya.”[*]
