It only survives
as a lifestyle choice where women are kept as virtual slaves, without access to real education or even accurate information about the outside world.
There is no "culture" in which it does not result in marrying off children to men 20, 30 even 50 years their senior.
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If you want to even imply that tolerance should be shown to polygamists... you have to demonstrate folks practicing it in a manner that would not be considered abusive.
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The argument that it should be allowed is not the same as allowing gay marriage...
It it identical to arguing that men in NAMBLA should be allowed to fuck boys.
PS-
there is no law preventing as many folks as choose to from living together... no law preventing them from punching out babies, no law preventing them from entering into contractual inheritance and co-ownership of property.
You are confusing several issues here. As a "lifestyle," I'm not sure what you mean. If you mean as a sacrament in a fringe religion, where multiple marriages are arranged with pre- or barely-pubescent girls, then yeah, that's criminal.
Not all multiple marriages are like that.
The FLDS group is in fact sort of like a hetero NAMBLA, but not all who would practice multiple marriage are like that.
As far as I am aware, marriage of any person who is below a certain age is illegal - male or female, couple or multiple. There are already laws that address that issue.
Making it illegal for informed, majority-age persons to marry whomever they choose is stupid, and actually, unconstitutional.