Like most of the world, when humans are involved, it gets messy. And when Lester is involved, it gets “simplified” (or more accurately distorted) beyond recognition. Is it a horrible thing that happened? Yes. Was the decision to allow people who ARE transgender to use the bathroom of their preference the key issue? Absolutely not. That boy was NOT transgender (or not only that). He was a rapist. Was it easier for him to enter the restroom for females than it would have been if he weren’t claiming transgender? I dunno. Depends on a lot of circumstances that haven’t been mentioned: How crowded was the hallway? (probably not very) How crowded was the restroom? (probably empty: He did feel safe in raping her there) Did other people know him as female? Was he dressed as obviously female? Would the kids have prevented the entry of a boy into the girls restroom? Would they even have gone to get staff to help? I dunno any of this.
Bottom line: He (yes, not “she”) committed a rape. In a closed room. That happened to be a restroom.