Does excess testosterone help foster anti-social tendencies in males? Interesting study.
I wrote a blog post on a similar phenomenon in primates a few years ago. I will have to try to find it but if I remember correctly the researchers surmised that an evolutionary hurdle was broached when beta males formed social contracts to blunt the power of some bullying alpha males whose behavior was deemed contrary to the best goals and health of the clan.
Found it, Constraining the aggressive alpha male.
Imagine early hominid life as a tense balance of power between alpha males (and an ally or two) and the larger set of males who are shut out of power. Then arm everyone with spears. The balance of power is likely to shift when physical strength no longer decides the outcome of every fight. That’s essentially what happened, Boehm suggests, as our ancestors developed better weapons for hunting and butchering.
Once early humans had developed spears, Haidt continues, anyone could kill a bullying alpha male. And if you add the ability to communicate with language and note that every human society uses language to gossip about moral violations, then it becomes easy to see how early humans developed the ability to unite in order to shame, ostracize, or kill anyone whose behavior threatened or simply annoyed the rest of the group.