I'm pretty sure the OP is trying to provoke us into hostile comments on trans people. I know this will shock you, OP, but there are some very not nice people in the world. Some of them used to come to my school when I was a child (it was on the edge of a public park) and expose themselves to us. Some drinkers from a nearby pub would stand opposite the school, which was on a small, not busy road, masturbating. There are men who are sexually excited and fulfilled by making young women and girls look at their penises, erect or flaccid. These are the people who WILL take advantage of self ID to gain access to spaces where they are entitled to expose themselves and where there will be no legal way of preventing them.
Then there are the people who will claim to be trans in prisons to take advantage of what they perceive to be the privileges women have in a gentler regime, plus access to women for sexual purposes. If you don't think this will happen, look at this story about inmates identifying as Jewish to get kosher food.
www.thejc.com/news/uk-news/scottish-prison-sees-number-of-jewish-inmates-soar-as-they-claim-kosher-meals-1.63580
Most people who are in prison are there because they have no problem with flouting rules and regulations. What do you think will happen? They are bored, they are sexually frustrated, they are natural troublemakers and they will take advantage of the trans rights that are being fought for blindly, stupidly and aggressively by trans activists. Discussing this is not transphobic any more than having a burglar alarm is discriminatory. There is a serious danger here and it's not scaremongering to say so.
The majority of trans people are not the issue, except in so far as the rights to self-ID that they are pursuing will cause problems for them, and for women, and for children. I think if trans activists weren't operating in bad faith they would be listening to women instead of calling them TERFs and would be equally concerned about public safety. I know there are lovely, genuine, well-intentioned trans women and men out there; they are not the ones controlling this narrative or campaigning for access to the spaces and rights women have battled to attain. There is a streak of misogyny a mile wide in a lot of what trans activists say and do, and I find that unforgivable. Silencing women's concerns and shifting attention from women's issues to trans issues is deeply hostile. The language that they use is abusive and reductive. (There are many trans people who choose not to use that language, which I appreciate.)
I am not a TERF, but I strongly oppose self-ID because I have been a target for male sexual aggression since I was a child and I am not stupid enough to think anything has changed. Only someone truly naive (or someone who had not grown up as a girl) would expect anything different.