I respond more substantively later when I have time.
In the meantime, let me remind you that polygamy as it exists in this nation is pernicious. At least, every example I have seen is pernicious. I've seen a few different nightly news shows where they looked at polygamous families. In every instance I've seen, there is a patriach (meaning: dominant man, i.e. the ultimate decision-maker and boss) at the center of the family who has several wives. In every instance I've seen, this patriarch takes daughters of his wives to wife, and often at an early age (13 to 15). Point me to an example that does not follow this model, and I'll demur, but I have not seen such an example.
By modern standards, I think a man dominating submissive women and marrying his daughters when they are not yet of the age of consent is "pernicious."
Not addressing your philosophical/political question, I realize, but a little "reality check" is often in order when we're discussing things that hypothetically aren't bad but in practice are.
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