PhilosophiCat clarifies that she doesn't mean harems. I think that she told traditional gender norms. Modern, not post-modern, society was built on enforced monogamy; women couldn't typically earn money on their own, and having a steady job was an essential requirement for a man.
However, it's probably hard to believe that because she's talking about eugenics and said she hopes Hitler would be proud. In her defense, many women don't think about whether or not a man can provide for her and the kid, and you get many single mothers on welfare - low IQ children are born of low IQ parents and the most productive members of society have to support them!
It is scientifically factual that we have twice more female ancestors as male ancestors. On average, every man who ever got to reproduce had around two children, whereas only one and a half children per woman. The nuclear family is a relatively recent phenomenon.
And that's because most men didn't live long enough to be fathers anyways. Those who were intelligent, strong, and competent enough to live well into adulthood had their pick of the women.
Modern society as we know it did away with harems in favor of an egalitarian approach to marriage. Being only allowed one wife means that more men would get to become fathers, and almost all men have reason to participate in society. When you get people together in large communities, this is vital!
We're not seeing patriarchal harems anymore now. It's much worse! Whereas in the past, the man would still have to financially support his multiple wives and children. Now we're getting the dumbest men fathering children, which has a lot to do with modern Feminism and overall societal decadence.
If humankind were brought back to the stone age, it would mean that all of the low IQ or weak men would die off. And the men who survived could become fathers and pass their good DNA to the next generation.
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