So your okay with trans people as long as you don't know they are trans? THis sounds more and more like this is your hangup.Dodging the point as usual.
Trannies passable enough that a genital check would be needed are not the problem. They've been using the ladies room probably since the day after they hung the first "Ladies" sign.
Anyone who is letting a 9 year old wander around without superstition should be more worried about Dingos than trannies.It's when obvious males like "Lia" Thomas want to walk in the girls room with 9 year old females and expect the little girs to "affirm their gender" or be punished for bigotry that it's a problem.
The point - as you know- is that if 6 year old girls are supposed to be comfortable peeing in a bathroom with one or more lightly disguised men because they can lock the stall door then lightly disguised men will be even more comfortable peeing in their own bathrooms with the stalls.
What logical objection could there be to that?
Again, all of this sounds like your hangup, not theirs.