But the Overton Window shifted and no one really cares if the gays marry.
Trans people are even fewer than gay people and there may be a number of real, or kinda real, arguments to be had there, such as the wisdom of giving younger kids hormones, or if trans athletes should be allowed to participate in gendered sports leagues. They make a fantastic wedge issue, with the benefit that they're 0.3% of the population -- political footballs, with no chance of actually burning a voting block.
"They want to destroy us!"
No, fam, that's not quite what's happening here. None of them (with power) wake up thinking "trans people are a menace that must be stopped." Now, it may be just as bad - but to them you're just a useful pawn, which requires different tactics from "this is exactly like Nazi Germany."