How many cases?
See, this is a public policy issue. How many resources are we going to expend to ensure that a handful of cases across, let's say North America, are going to be prevented?
Who's going to enforce these issues? At what stage of transitioning will the laws draw lines?
What if a trans person was born a man, then went through full transitioning? Is that person still a "man" and uses men's rooms? If yes, what guarantees that person's safety? Will it be a hate crime if they're brutalized?
If we find a male, that simply threw on women's clothes, and entered a woman's restroom/locker room and showed his penis, how would he be treated legally?