That is because the "left" doesn't care about gay people (or anyone for that matter). People who subscribe to leftist ideology make themselves into unwitting tools for the real power players behind the scenes. Folks who would throw down anyone no longer useful or convenient for them.
I believe the practice of a "gay"/homosexual lifestyle harms people. That said, as long as the behavior is between consenting adults and not lauded in my faith community, I am pretty much a "mind your own business" type person. I would gladly see people leave that lifestyle and have healthy families, but I am not out to control other people. The "LGBTQ… movement" is not about helping people living in what used to be called "sin", but about making them into a voting block, dependent upon Democrat "masters".
The most dangerous, but maybe loving thing to do is to bear witness to the truth of the Gospel by living your faith. That means not lauding or excusing behavior that harms people. It certainly does not mean creating a second class group of people who just like African Americans have been thought of us a voting block to manipulate, by leftists, who don't care how many die.