Getting a sex change, by itself, isn't a mental disorder.
But the mental trauma one endures, requiring a sex chance, IS psychological in nature.
It is so traumatic for some, it leads to severe depression and suicide.
And that isn't meant to be a negative Label (ie: a conservative vs. liberal issue) ---
it is a medical and psychological matter that requires help and correction. Like many other illnesses.
conservative & religious types just like giving it a negative connotation because,
as usual, it makes them feel better about themselves.