Because while innovations on human culture are created by randomness—environmental pressures, local mutations, individual decisions that get adopted or nixed—it’s not actually true that human cultures develop in entirely random directions. For example, once your culture’s gynecological knowledge and traditions reach a certain level of effectiveness, they rapidly outstrip sexism’s usefulness. And when there’s finally enough gynecology, like safe contraception and abortion and proper prenatal and postnatal care, but there’s still a lot of sexism, being sexist can even undermine gynecology.
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