Here is something that I think is always missed when we are tiptoeing around safeguarding regarding this issue.
Trans women, of course, need protections and safety themselves, of course they do, and a right to live as they wish. I don't think trans women, just because they are trans, pose a threat to women and if there was a process by which they could be assessed against a set of criteria, I would have no problem at all sharing safe spaces with them (though I only speak for myself, not other women).
However, right now it is not only trans women who are able to identify as women, is it? Who is in this other group of men identifying as women? What are their reasons? Because a man's reasons for identifying as a woman if he is not trans can only be nefarious. Therefore, any man identifying as a woman IS a threat unless there is a sure fire way of knowing whether or not he is trans, isn't he?
We do the same for teachers. Anyone who says they are a teacher when they are not must be doing it for nefarious reasons. Anyone who says they are a police officer when they are not must only have nefarious reasons.
Why is this huge safeguarding chasm so difficult to bridge.