Over and over again the researchers looked for signs that this increased in-group love would be paired with increased out-group hate (toward Muslims), but they failed to find it.34 Oxytocin simply makes people love their in-group more. It makes them parochial altruists. The authors conclude that their findings “provide evidence for the idea that neurobiological mechanisms in general, and oxytocinergic systems in particular, evolved to sustain and facilitate within-group coordination and cooperation.”
