Which is exactly why it's imperative that they not have the choice taken away from them again. Heck, most of the things that we persecute or discriminate against people for are things that they were born with or had no choice about; but they're still part of those people's identity and how they live their lives, so it should be their choice whether to change them. There are many people in real life who take pride in their identity as people with disabilities, e.g. the deaf community, which has its own distinct language and culture and social network. Forcing a "cure" for deafness on them all without giving them a choice would be tantamount to cultural genocide.
Accusations of mental illness have long been used as an excuse for persecution and genocide. Women throughout history have been declared mad simply for asserting their independence and choice over their own bodies, or for disobeying their husbands. You're heading down a very, very dangerous and ugly road if you start to argue that anyone can be stripped of their human rights just because someone decides to label them insane.