why the church is fighting gay marriage

[MikeWaters]

Is it possible that what the church is very afraid of is the legal recognition of polygamy?

I believe the church would be very much in favor of polygamy remaining illegal.

But even if it was legal, all the church would have to say is "Lord still doesn't want it right now. Not a commandment."

But even then, it would create a pandora's box. Would missionaries teach polygamous families? If they joined the church, would the church require divorces of the "extra" wives? I believe that this is the church's current policy.

If you were a member, and you legally married an additional wife, would this be prohibited? Would you be excommunicated? Even though it was known to be a marriage for time only (at least before proxy ordinance).

Yes, which brings up proxy ordinance. Would we do proxy sealing on contemporaries who died as polygamists?

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Now imagine the other side of the coin. I find it impossible to believe the church would reinstate polygamy. But let's say it happens. Imagine the pitfalls and problems. They are too numerous to even begin to describe. A lot of Mormons have worked a long time to be socially accepted in America, and that would be wiped away in one moment.