As absurd as it sounds now, quite a few people genuinely believed you could be born into the wrong body. It wasn't just a gender dysphoria thing, it was a some kind of chromosomal mistake.
It was all deliberate tho. Not their fault, nothing they can do about it, agonising, the only thing to help is to identify as the opposite sex.
Because if people were asked do you mind if men come to work fetish gear, of course we all know what the answer would've been.
Hence the need to provide a generation of children who think they are trans. It's all retconning.