And societies evolve. They are fluid. What went before is past. This is now. Gay was a mental illness until recently. 1990. Now there is even scientific evidence in support of homosexuality. "2008 Gay brains structured like those of the opposite sex" "2017 Biochemical evidence to support this effect was confirmed --" .
Nobody sensible now doubts that gay is biologically based, and not a choice or an ideology. That may yet be proven to be the case for trans people too. Or it may not.
I don't know, and nobody here knows, the exact cause of why trans people exist, and have existed for thousands of years. And since we evolved, and were not created, must have existed in some form, for far longer than just a few thousands of years. To suggest that it's recent, is not sensible either. Cave people didn't understand many things. Nor did those of 1900. Estrogen wasn't even isolated until 1929. So what?
Transgender history
Accounts of transgender people (including non-binary and third gender people) have been identified going back to ancient times in cultures worldwide.
https://en.m.wikipedia.org/wiki/Transgenderhistory
Hijra 4000 years ago.
https://reclamationmagazine.com/2020/06/29/hijras-the-age-old-transgender-community-in-south-asian-culture/
Of course modern societies exploit modern discoveries and explanations. Research into trans people's brains, still in it's infancy, may prove you right. Or it may prove you wrong. It's ongoing research. A lack of results, doesn't explain trans one way or the other.
Meanwhile, trans people exist, unexplained or not, and this being a democracy, what rights they have or lose, will be decided by voting. Of course safe spaces are important. Nobody sensible says it isn't important. Even trans people agree as I understand it.
A definition of something may remain fixed for millenia. And then it may change. It doesn't upset me one way or the other, if trans women are called women or not. A rose is a rose and all that. They will still exist no matter what label they carry, and increasingly society is, broadly happy to accomodate them; -- because in our democracy, that appears to be what the majority support.
That may yet change of course. But on the evidence so far, the incoming Labour government isn't going to reduce trans rights. They are more likely to maintain them or even stengthen them.
Phisically, when born, a trans women is a male. A trans man is a female. Logically yes. Depending on exactly what constitutes the definition of male/female, I don't see why there should be an argument about that.
The degree to which it's accepted, that surgery changes the equation, is conentious.
This thread, started about Keegan arguing with Barnett, that having full reassignment surgery makes Keegan happy to call a trans woman a woman, and a trans man a man.
But gender seems to be the big issue. Does gender exist, what ecactly is it, and is there a biological basis for it? Simply calling it an ideology doesn't explain it and doesn't solve any problems. Esp's since ideologirs of various kinds habe persisted for millenia.
What are the oldest ideologies? Religions? I don't see those disappearing anytime soon.