If the cause of gender dysphoria is unknown in a patient and the prognosis of treatment is uncertain, then radical treatment with morbid side effects isn't justified
Discussion
I think it's important to remember that the same people calling for this medical treatment also advocated strongly for eugenics.
When I say the same people, I do mean the same people. Tommy Douglas, the socialist premier in Saskatchewan who is widely considered the father of Canadian universal healthcare, was a strong proponent of eugenics as an example but far from the only example.