Responding to my post about "Natural Law, " Zenith545 wrote, "What about cultures where polygamy is normal for them?? Did they not get the 'built-in'??"
Cultural customs are not the same as natural law. Obviously, whole cultures can violate natural law in some ways, but maybe not in every way. In a culture that tolerates polygamy, for example, stealing someone's wife might still be considered a "built-in" wrong. It was a polygamous culture that transmitted to us the Ten Commandments, which forbid coveting another man's wife. And before we judge such cultures, ask what are the status or prospects for an unattached woman in a society where her opportunities to support herself by employment are nonexistent, and where the number of available husbands has been greatly reduced by warfare. In such a society, being one of several wives of the same man might be the woman's only hope of a secure livelihood (other than becoming a prostitute, perhaps).
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