It’s not about a single transwoman using a ladies loo though. What will happen if self ID goes ahead is the following:
Men who are not trans, but are predatory will be able to access female spaces. And they will - predatory men will use any loophole they can to access victims.
Women will have no right to challenge them. The social convention that marks out a man in the ladies as a danger will be gone. Where changing rooms have become unisex in the USA, voyeuristic and sexual crime against women has tripled
If self ID goes ahead, men will be able to self identify into women’s prisons. Not in a case by case basis, there will be no way of refusing them. Women have already been harmed by this.
Safeguarding provisions will be damaged. Children of both sexes will be at risk. Take the girl guides for example - parents are already not being informed if a male bodied person is sharing a tent with their daughters. Right now GG has all female leadership which is in itself protective - men cannot access it. If self iD comes in, how many predatory men do you think will decide being a guide leader or volunteer is a good idea and will allow them access to girls? Note that I’m not actually talking about transwomen here at all - I’m talking about predatory men who will exploit any loophole they can.
Oh but men wont do that... they do. They have. They will.
Almost all our child safeguarding rules and procedures were brought in after awful crimes exposed loopholes in safety procedures. Ian Huntley was able to get a job as a school caretaker despite previous convictions because there was no national system of linked up background checking. There is now, because of that crime. (Huntley now identifies as a woman by the way, if that’s in any way relevant.)
Will someone who committed a crime as a man be able to be picked up in DBS checks? No one seems to know.
Will self ID mean that men are allowed access to children where they were not previously? Yup. Already happening (see girl guides.) TRA groups are pressing for confidential disclosure in schools - ie if a child tells a teacher they’re trans, that teacher can keep the confidence- that is simply an abusers charter.
So that’s just plain old men. Who have always tried to abuse women and kids, and will do so using any loophole they can.
What about transwomen? Well studies show they are no more or less dangerous than men in general. They retain the offending pattern of their sex even after transition.
So no one is saying all transwomen are a danger. They’re not. What they are is as dangerous as any other Male, and that’s why they do not belong in female only spaces, or in any arena where men are excluded for safeguarding.
This really is no longer a live and let live situation. It’s a small but powerful group of people actively trying to remove the protections of women and children.