This started out as males posing as females needing to use female restrooms to keep from getting attacked.
You forgot to post evidence for this.
And why would you suppose kids don't attack other kids?
I have no idea if they are, or aren't. You presumed it, so provide evidence already.
The only times in my life I was ever physically attacked was when I was a kid by other kids. Girls have been attacked by trans students in girls school restrooms.
You keep forgetting to provide evidence for your assertions.
Stop and think for a minute about all the places that have public restrooms. Elementary schools, middle schools, high schools, collages, universities, office buildings, theaters, hospitals, libraries, bus stations, train stations, airports etc etc. It's your idea to build zillions of single use restrooms, so you're the one who should be thinking out how that's going to be done in a practical way.
The idea was suggested (I forget who initially proposed it), and it would certainly solve the problem you seem so concerned about, that of women being attacked by trans folks. Now you seem to be saying that protecting women isn't cost effective, so why bother?
I guess I'm just confused as to how concerned you are about this issue. And since you've posted no stats or evidence to suggest this is a significantly pervasive issue, we have no idea whether or not it's really all that much of a problem.
For example,
I do have some stats available: two thirds of all sexual assaults occur in or near the victim's home or a relative's home (55% + 12%). Only 10% occurred in an enclosed, but public area like a parking lot or garage. Bathrooms probably fit into this category somewhere, so let's just say less than 10%, at best. 8% occur in schools. Further, putting aside
where attacks occur,
most victims are attacked by someone they know, usually someone they're intimately involved with.
There is no data on how many of the perpetrators are trans, though. Given that they are a significantly small part of the population, it'd be difficult to conclude they contribute more attacks, per capita, than an average person, unless there is specific evidence that indicates otherwise.
This isn't to say that sexual attacks aren't something to be concerned about...but targeting trans people as perpetrators doesn't seem warranted, given how many actual attackers you'd ignore in doing so. Plus which, focusing on a small percentage of the places where attacks happen also does nothing about the far larger number of attacks that occur elsewhere.
So, is the problem actually women being attacked? Or maybe, just possibly, could it be something else?
-- A2SG, not gonna speculate, you'd have to tell me.....