If you’re so concerned about your granddaughter, why aren’t YOU going in with her? Some government law isn’t going to stop perverts from using the bathroom to get their jollies.
Should we put police in every bathroom nowadays? The potty brigade?
I’m an old guy. We never let our young granddaughter go into a large, public bathroom unescorted by another female.
Some times when she was very young, I did take her into the Men’s room.
Problem is in places like Target, Costco, etc.
What is needed is the old concept of “Restroom attendants” of the same sex.