I don't agree with either form of marriage, but facts is facts and while he's in Deseret/Utah it was not illegal to be a bigamist. That was a huge point of v\contention and required a change of LDS rules before Utah would be admitted to the union in the late 19th Century.
Little did we know how ahead of the game they where. If only they had rewarded sodomy they would have been ready for the 21st century.
Polygamy was a well established form of marriage for many societies throughout history.
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That didn’t make it right..
and it certainly was never Biblical..