Humanity may not be as stupid as you think.
According to this:
http://eh.net/encyclopedia/article/haines.demographyBirth rates in the US in 1800 were estimated to be 55 per 1,000.
By 2,000 birth rates among whites in the US were as low as 13.9 per 1,000, while the birth rate among blacks was estimated to be 17 per 1,000.
This appears to fly in the face of your premise that, "Humanity appears to have evolved without a crucial internal self-restraint mechanism. ..."
During the last two centuries (in your observation) we were circumventing our "external restraints." That being the case, why hasn't our birth rate increased?
Looked at from another angle, the rich have virtually
no external constraints, so why aren't their families
huge!?
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