Can you explain why any people born male should be allowed into spaces that are currently women-only, just on the basis of their self-declared gender identity?
There are obviously transwomen who have lived as women for 20 years, had all the surgeries, you or I would think they are a woman. I think it's pretty messed up that if they got sent to prison, they would have to be housed with men, where they would be at extreme and highly likely risk of violence/ sexual attacks. I do not think that them being housed in female prisons would put the women there at a similar level of risk.
But - not all transwomen are like that, are they? Ans that's the problem. I think that the vast majority of dangerous transwomen, who want to cause women harm, aren't actually trans. Which I know goes against stonewalls definition and makes me transphobic or whatever, I've heard the usual arguments and I won't be offended by them - I'm not a TRA, remember. It doesn't matter to me if some batshit people reckon Karen White or the Jonathan fella are actually trans.
And how we would stop predatory men claiming to identify as women using self ID to gain access to vulnerable women?
Which brings me to your next question. I don't know. I think the arguments for self ID are pretty weak, tbh, though I can't say I've read too much outside of FWR and the linked threads there, which obviously only gives one view. I do think that in an ideal world, these decisions would be made on a case by case basis, to separate the fictional transwoman I describe above from the Karen White's of the world. But then, as I said earlier, subjectivity and human bias is going to mean that women may be put at harm.
On the other hand, I'd feel desperately sorry for the transwoman above having to be placed in a men's jail. I guess there's no answer that keeps all of the good people safe, and all of the bad people far away from everyone else - no matter what their sex or gender identity. I have empathy for all of the innocent involved on both sides.
In short - I don't know what to do for the best. I guess if I had to answer than a third space, which I still don't think is ideal, but probably keeps everybody as a whole at the least risk of harm. Would still put our transwoman with Karen though, which is shit.