And the assurance that one will, and the other won't use the woman's restroom?
What the left is refusing to acknowledge is that this wasn't a problem. Transgenders who believed they were women dressed like women and blended in.
It is fairly rare to encounter a transgender since they make up such a tiny percent of the population and no one feared them. Perverts make up a much larger percent of the population and you are far more likely to encounter one of them. So, yes, people will be vary of anyone now and this law is to blame. Instead of not making a big deal out of it, this law calls what is likely unwanted attention to transgenders and will make people more wary because no one can tell if a man is a real transgender or not. Of course, the first clue is that they are dressed like a man. When we have incidents, like the man in Chicago taking advantage of the law and attacking a young girl, people will begin to have a more negative view of transgenders. Not fair, but they are being lumped in with every weirdo who uses the law to their advantage. A law supposedly made to help them will open the door for the sick scum who do want to attack.
Some say they won't, but they already have. A man need not be in a dress to choose the ladies room and that part needs to be changed if this law stands. There was no need for the law because no one questioned it when women, or those who looked like women, used the ladies rooms. Allowing people to use any bathroom they want with no questions asked is just plain stupid.
Some people are actually born with both gender parts. In those cases, the parents generally choose a gender for them and the thinking is that it will make things easier and they don't want the child to feel like a freak. Sometimes, they choose wrong. It's a rare problem, but it happens and in those cases, you can have a woman in a man's body or vice versa.
It's just rare and there was no need to call negative attention to it by suddenly creating a law to solve a non-existent problem. If a person is having identity issues, being the only one in the shower room with male body parts sure isn't going to cure those issues and it certainly isn't going to help the others that have to deal with it.