Yes,I've seen weirdos in public toilets. I ignored them, latched the door and did my business. But having a guard at every woman's public toilet to stop freaky looking people from entering isn't feasible.

The parents you mention are wrong and I agree with that - that is encouraging their children in some way to think they're in the wrong bodies. OTOH trying to force them to be something they are not (those who believe they're in the wrong bodies) is not a good idea either. I assume you never knew or worked with a tranny.