How Do You Rebuild Your Life After Leaving a Polygamous Sect?
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That kind of thinking is exactly why these sorts of communities become so closed to outsiders. When communities are more closed they must rely more on each other internally which means they must work harder to keep the peace and can't challenge abuses of power within their community. That paves the way for more abuse. More abuse paves the way for more contempt from outsiders. If your ancestors were all arrested by the state police for living the way they believed they should live and outsiders generally looked down on you you wouldn't exactly be in a hurry to rock the boat by calling attention to the community's problems either.
What a wonderful feedback loop it is. Society really sucks at not isolating groups with non-mainstream belief structures.
It's nice to see that this particular group mostly broke its way out of the downward spiral before it got too bad.
Which cause is first and which effect second?
Sometimes the leaders of these WANT to isolate and close off. This is a standard mechanism of psychological control.
However, things do change with time. I suspect most people in the US now regard polygamy as silly and stupid rather than an offense against society. Polygamy has been shown to have particularly bad destabilizing effects on a society overall; however, I suspect that a place like the US could actually weather polygamy now given that women have much more power and mobility.
Of course---partners are not evenly distributed, leading to numerical outcomes more akin to polygamy than polite society might pretend.
I don't know that many people who are having sex with multiple partners simultaneously in spite of Tinder and the hookup culture.
The nature of a positive feedback loop is that it doesn't matter much in practice; it is a never-ending cycle where each step leads back to what preceded it.