This is part of the issue.
But it's not the key part of the issue.
Missionaries and members open up to me. They talk to me unlike how they talk to their leadership. Their words, not mine. I'm special like that.
And, amazingly, I had someone message me the morning about this very topic. I showed someone on this forum the actual message, with names redacted.
The world has gotten much, much smaller. In 1950, you could go your entire life without meeting an open gay person in Utah (again, their words, not mine). Now, since LDS youths know gay people and like them as friends, they simply ignore the church teaching on LGBT sexuality issues. It’s the same with their Catholic friends, atheist friends, etc. It's good, because LDS and Catholics no longer hate each other because they've gotten to know one another. It's bad, because now I know Peter, who is gay, and he's become a good friend. So what do you mean he can't get married? What? He’s going to Hell? No he isn’t.
The Baptists and the Catholics are dealing with this too, so LDS are not alone.