I think people are creating a problem where one didn't exist. Where were they going to the bathroom at up to now? I have never encountered this problem in any bathroom. I bet most here haven't either. Don't most parents go in the bathroom with their young kids to begin with? On this gender subject, what prison would they get sentenced to. I bet if they could chose, they would chose a women's prison. Male or female. Should have started this in politivol. Sorry.
Parents can't be with their kids 100% of the time. And, no, parents by and large don't go to the bathroom with their young teenagers, nor should they have to. As a society we shouldn't have to worry about our kids when they go to the bathroom.
You don't think there is a problem? The interwebz is full of videos shot illegally in womens public restrooms of girls and women of all ages. Who do you think is taking those?