Trans women's rights are themselves a subset of women's rights as a whole.
A world where trans people cannot legally exist, is a world that is significantly more dangerous for everyone in it

If you can be disappeared and blacklisted for being trans, then the government can justify blacklisting you by labeling you as trans.

How are you going to disprove it, showing some Proud Boy a full frontal view of your vulva?

I don't know about you, but I personally wouldn't trust any enforcement of an anti trans law even if I weren't trans
I would definitely feel uncomfortable unveiling my little thing down there to some genital inspector, and everyone else would be uncomfortable too