The worst part about this is that parents like this, if they're not Jeanette style histrionics, they're often genuinely kind people. They're absolutely brainwashed, but they believe in the depths of their souls that this is how you act if you're kind, and generous, and supportive, caring and most importantly, good.
A few parents I've met in this situation grew up in pretty dysfunctional ways and seem to think this is how they write the wrongs they lived, by validating and supporting their children into developing into their own unique selves.
They absolutely believe that social transition can be turned back, that puberty blockers are a pause button, and they have almost the entire medical/pharma industry singing their praises, not to mention all the creepy troons salivating at the idea of another child being a slave to unnatural hormones and living delusionally like them. And that's really the worst part of all, that these parents are causing genuine harm to their children aren't all eeeevil narcissists. I wonder if in a decade, this will be Satanic Panic of our times, or if we can even get these folks to wake up and see the damage they're doing.