What I mean is, how do you know that the tribalism gene is gone? I’m pretty sure that if the people that “have no tribalism gene” grew up in an environment where tribalism was normal, they would have developed the traits just like everyone else.
It’s very arrogant to assume someone who is not acting in a tribalistic way has in some way a different biological make-up, as if they were some kind of more advanced lifeform. It’s very likely pretty much the same genetic code, just expressed differently through environmental factors.