This is a really important point.
I feel that women were coerced into agreeing that trans women should be in women's spaces because, poor trans women, it must be so difficult living with such debilitating dysphoria and at the same time being so vulnerable around other males, and so we should learn to put aside any discomfort we might have about sharing single sex spaces with male people and make room for them.
Then once the principle that genuine, vulnerable, truly dysphoric, wouldn't harm a fly trans women should be allowed in women's single sex spaces was established, the lobby groups set about removing all these qualifiers. We now have a situation where mainstream politicians will go on record saying that male rapists should be housed in women's prisons if they feel that best suits their gender identity, and that there should be no requirement for someone to be diagnosed with gender dysphoria in order to change their legal sex. And suddenly we're a very long way from the sweet, gentle, terribly distressed and dysphoric hypothetical trans woman we started with.
This kind of creep is absolutely typical of this movement and we see it as well with language.
First they were transvestites. Then they were transsexuals. Then they were transgender. Then they were trans women, but they all assured us that no one was confusing sex with gender. Then it was trans women are women and now it is trans women are female. So we've gone from transvestites to the female penis, and women no longer having any words for themselves at all, except in very specific contexts where we may be permitted to refer to ourselves as people with cervixes or menstruators. But we are not allowed to have a word to describe ourselves as a sex class which includes all female people and excludes all male people.
It is important to recognise this pattern because if we do not, we risk becoming the metaphorical boiled frog. We start off thinking about a reasonable compromise, and the water is only slightly warmer than we are really comfortable with, but then before we know it we are being boiled alive.
It's tricky because those of us who have been embroiled in this debate for a while now are rightly sceptical about whether any compromise is possible because we have seen what happens when we give an inch. But I think newcomers to the debate have to experience it for themselves. Because they see us hardened "TERFs" over here and they think we are being very black and white about it all, but they haven't seen the journey we've been on to reach that position, where all the compromises we have offered have been met with further demands or rejected out of hand.