My theory is that there are a lot of young liberals who weren’t around when the Civil Rights movement started in the 50s/60s and so wish they could be part of something like that, so they latched onto the whole gay rights thing, because it makes them feel like they’re part of something like that.
Even though one movement was based on characteristics, skin color, that a person had no control over and should have no bearing on their behavior, and the other is based on a chosen behavior, making it an apples to oranges thing.
Well, the party line is that gays “have no choice”. Which is BS and they know it—otherwise they wouldn’t try to turn people.