Then clearly we should live in an anarchy. Like, what's your point?

We could outlaw using meth. But if is legal to sell, import, produce, and store meth. Then it is too easy to break the using meth law.

We could outlaw getting in car accidents. But if it is legal speed, drive drunk, and run red lights. Then it is too easy to break the car accident law.

My point is sure we outlaw harrasement but for those that may want to do that, allowing them to go into a room where women are alone and disrobed would make it too easy to break that law.

This prophylactic argument might be a reasonable one if there were an epidemic of transgender women (or, for that matter, cisgender men) harassing cisgender women in the bathroom. But, instead, it is virtually unheard of. The empirical evidence is that, today, the combination of informal social norms and retrospective laws against, e.g., lewd conduct and sexual assault are more than enough to discipline' people's bathroom behavior.

we should legislate that all men must be under constant video surveillance. not being on camera makes it too easy to break the law.