This incident would happen even if you did ban trannies from women's bathrooms. He would have still dressed up this way and went in and did what he did.
That shouldn't stop the 99.9% of trannies who just want to take a piss. Sort of like your gun argument. Just cause one gun nut did what he did, doesn't mean we can't all own guns.
Transgender and gender-nonbinary teens face greater risk of sexual assault in schools that prevent them from using bathrooms or locker rooms consistent with their gender identity, according to a recent study.