“If someone passed laws that were flagrantly unconstitutional and stepped all over you, would you follow them, or would you at some point simply ignore them?”
Just let me ask this before I disengage.
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Translation: before I run away
Are you aware that until the 1930’s, Mormons took oaths in the temples against the US Government and to kill the descendants of those who killed Smith?
How ‘American’ /sarc
For starters, polygamy was illegal from the moment of smith's initiation of the practice. That should be a no brainer for most people. Since it was illegal and those laws stood constitutional muster- then tell me - what was unconstitutional about laws directed at the originator and sustainer of the practice?
Secondly, Young attempted to operate separately from the country - establishing his on little kingdom and a theocracy. They installed their own judges, chased away federal officials sent to perform their legal duties of oversight of the territory, ruthlessly attacked and harassed wagon trains of settlers enroute to Oregon or California.
In short, they had set up a renegade empire operating illegally and in open rebellion against the US Gov't. Given the facts you ignored in your previous, the laws were deemed constitutional and the government of Utah had to be forcibly severed from the mormon church's theocratic rule.
Don't forget - Under Young's dictatorial rule non-mormons were killed or chased away, apostates were hunted down and killed, and indian tribes killed and chased off as well. Things were not peachy keen under his rule.
For a church that claimed as one of its articles of faith "We believe in being subject to kings, presidents, rulers, and magistrates, in obeying, honoring, and sustaining the law." They did all they could do to not be subject to the President, magistrates and honoring and sustaining the law.
Your question is invalid in this case.