I read How humans tamed themselves with interest and I have not read the related scientific article(s). But the obvious thing that came to mind, as a parent, is that there is an another obvious hypothesis.
We were tamed by being parents. Our children do not take 6 months or 1 year or even 3 years for basic functionality and not the level of functionality needed to care for themselves until they are somewhere near 12 years old. Orangutans are usually cared for until they are about 6 years so that is pretty long.
When you are caring for someone, and it requires a group not just one person, then you have to put aside violence and work together. And (less domestic) individuals who don't do that, would end up being less successful, and be less likely to have children.
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