The point of them is to legitimize harassment. My best friend (NB, AFAB) told me a story about a time when they went to the women's room and a man started banging on the door shouting, "There's a man in there!" When they came out he realized his mistake and sheepishly went on his way. That's the purpose of the law, obviously it isn't really enforceable on everyone, but for people who don't pass or who as present in a queer or androgynous way, then suddenly strangers feel like they have a right to harass and interrogate us. It has nothing to do with safety, except insofar as the assholes want an excuse so they don't feel like assholes.