I can't understand how anyone with two brain cells can deny the social contagion that's obviously such a huge part of the rise in numbers among girls. I and every other parent of a DD I've talked to about it has experienced their DD going through a phase of everyone in the friendship group having to identify as LGBTQI++ or else you're not cool. Usually aged 10-12 and usually they then move on from it. But if it's affirmed by adults, and the girl is encouraged to see it as a real solution to normal adolescent woes, or is drawn in by the praise and adulation (especially if she previously felt left out, unattractive etc - or didn't fit in like many girls with autism) then she's going to end up keeping on down that pathway.
My DD's friends all bought the right flags and badges for their "queer" identities. My DD told me she'd "chosen" bi, and I could see why - she didn't have to prove anything or do anything and it was easiest. This is a group of about 10 girls with generally mainstream interests and styles, not even tomboys. Over 90% of them will be straight statistically. I asked if anyone had "chosen" straight and she said no of course not, you can't be straight.
I am bloody relieved I kept my cool and just went "hmm-hmmm" and she grew out of it, they all did. One persisted with being a trans boy for a while longer but it was so clear she had no interest in being a boy. She was just miserable about her parents' divorce and needed support and something to make herself feel more important and listened to, or a way to escape from herself. She never wanted to be in the boy's toilets, with the boys on a school trip or anything.
Obviously I have no issue with my DD being bi or gay or whatever, if she actually is, when she's of an age for it to be relevant. But them all deciding they were LGBTQ at 10 is CLEARLY social contagion, mindlessly encouraged by school.