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1.
Trans people already have to have years of therapy from multiple doctors and therapists to get the required letters of recommendation (verification that therapists and doctors have confidence that the person does experience Gender Dysphoria and that they believe that sexual transition would be beneficial to the patient's mental health) needed to get hormones and SRS (sexual reassignment surgery) and no form of conversion therapy has worked anywhere near consistently.
2.
It is just easier (at this point in time, at least) to modify the body to reduce dysphoria than it is to modify the brain to stop dysphoria altogether.