Except that being transgender is not considered a psychological disorder by most professional bodies these days. And therapy to try to get someone not to be transgender is not shown to be an effective treatment. It's even illegal in some places due to it being harmful. It's not good to cite psychology as evidence when the leading bodies of psychology disagree with you.The mere existence of psychology, the mere treatment of disorders throughout the past decades, is all the evidence necessary. If you want therapists who encourage and egg on disorders than I simply don't know what to say.
But I'm sure the American Medical Association, American Psychological Association, American Psychiatric Association, The Endocrine Society, France and Britain's national health systems, and a variety of other professional bodies that support gender transition could learn a thing or two from a random guy online and his opinions.