You are asking us to fear the bogeyman.
To whit: a transwoman who visits public toilets with the aim of raping cis-women.
I'm not saying your bogeyman is an impossibility (because human beings are infinitely various) just that if I came across this character in a detective novel I'd mark it down as unlikely.
As you know- and as anyone knows who has given it a moment's thought- the most dangerous place in the world is the family home. That's where you're most likely to meet your abuser, rapist, murderer.
And they won't be a transman or a transwoman but someone you know and thought you could trust.
Bogeymen belong to fiction. They're vanishingly rare in everyday life.
When members of a minority are demonised by fearful members of the majority it's called a witch hunt.
There was a time when I had you pegged as being on the side of the witches. I'm sorry your fears- your unreasonable fears- have tipped you into the opposing camp.
It's very Muggle of you.
Fear is the worst possible basis for a philosophy, a religion, a public policy, a Tweet.
Fear causes the innocent to suffer and deforms and twists the person who projects it.