This is excellent input you have added.
I wanted to add some feedback to this part you said:
If you are ejected from the tribe, even if you survive on your own in the jungle, your genes don't get passed on because you lack access to the opposite sex suddenly.
Ejected, yes, like a banishment. But, when instead of being 'ejected', one preemptively chooses to eject themselves, and gather others of like, who would be on the same alignment, and they together start a 'breakaway' society of their own based on their 'difference' with the old tribe that they feel should be part of the society they want. The fear of ostracism would then be channeled into drive for growth. I am barking up the wrong tree though in this current time. Globalization has pretty much gobbled up tribes and is cramming them all into one. The social ostracism therefore is more severe in my opinion, and it will get worse with the current trend looking the way it is.