Reality check, if you please.
Virtually every organized religion on the planet abhors homosexual sodomy. Those that have changed their stance (now including, apparently, the CofJCofLDS), have done so in order to slow the death spiral that our rotten culture has inflicted on organized religion. But who cares, right?
When I was growing up, homosexual sodomy was a crime in virtually every State (the Feds had no say in the matter, thanks to the Constitution). These laws were sporadically enforced - often not at all, but they did reflect the judgment of the GenPop.
Over time, some of those laws were repealed, but then something bizarre happened in Washington D.C. The USSC decided that (a) there was a "right of privacy" hidden somewhere among the emanations and penumbras" of the Constitution, and (b) perverse, private sexual activity (not including adultery) was PROTECTED by that imaginary Constitutional right. With this gambit, the Leftist Supreme Court effectively nullified all of the remaining anti-sodomy laws in the country.
Parenthetically, at around the same time, the AIDS pandemic came to our shores, and although everyone who was not certifiably stupid knew that it was basically a problem spread by anal intercourse among gays, "we" were compelled to suppose that it was a "universal" plague which endangered "everyone." In fact, my 10-year-old son was treated, in 1992, to formal classroom instruction on "safe" anal sex practices. At the time, there had not been a SINGLE CASE OF HETEROSEXUALLY TRANSMITTED AIDS in our entire county of two million souls.
But I digress...
So let's set the stage for where "we" were after the Supreme Court's discovery of the buggery right: ANY GAY COUPLE WHO WANTED TO could enter into a committed, monogamous relationship, do every sexual thing that their little hearts desired, and the official position of Government at all levels toward these relationships would be total disinterest. NOTHING and NO ONE could interfere with their eternal bliss. They could have joint checking accounts, buy a home together, call themselves "partners," "husbands/wives," or whatever they wanted. In one short generation they had gone from criminals to Fine Upstanding Citizens! They should have been CELEBRATING!
But...but...but...[Enter the Gay Mafia].
"We can't adopt kids." "When we die, our estate is taxed at a higher rate than if we were legally married." "We can't benefit from our partner's health insurance." "If my partner is dying, I can't get into the hospital to see him." Oh my, oh my.
So they DEMANDED to be allowed to MARRY in the same way the "normal" couples do. This was total bullshit. The purpose of marriage, legally, and culturally, is to create a framework that promotes and supports the nuclear family. And because homosexuals CANNOT REPRODUCE, it doesn't apply.
But the Supreme Court struck again. Based again on the non-existent right of privacy, it ruled that the States had no justifiable basis to discriminate against a gay couple when compared to a normal couple.
But again parenthetically, the more rational issue here was that some states had already formally sanctioned gay "marriages," and under the full faith and credit clause of the Constitution, every other state is required to recognize those marriages, even if the state does not allow gay "marriages" within its borders.
Gay marriage doesn't harm me. Slavery in South Carolina in 1850 didn't harm anyone in Massachusetts. The Germans' treatment of the jews (and others) in the 1930's did nothing to harm Americans. Some woman in Hawaii killing her baby in the womb is no sweat off my balls, so to speak. But moral people are implicitly required to recognize and oppose evil, even when that evil does not harm them directly.
So why would LDS now approve of gay marriages? As stated above, it is a cynical attempt to slow down its devolution into nothingness. Good luck with that.