People born with both sets, etc are suffering from syndromes and most likely have chosen a sex. What we're talking about are gender fluid, etc. types. You know, the ones who claim to be things physically and scientifically impossible. There are also the pedophilia types who will take advantage of being able to be this or that just to prey on kids. It's happened quite a bit already.

Your comment about a father bringing his daughter into the bathroom is a ridiculous straw-man. SOCIETY ALREADY ACCEPTS parents bringing their kids into the bathroom with them.

Also, transgenderism is a mental disorder, so there's that....
Dr. Paul R. McHugh, the former psychiatrist-in-chief for Johns Hopkins Hospital and its current Distinguished Service Professor of Psychiatry, said that transgenderism is a “mental disorder” that merits treatment, that sex change is “biologically impossible,” and that people who promote sexual reassignment surgery are collaborating with and promoting a mental disorder.