In the vast majority of cases, gender reassignment surgery results in improved human wellbeing. Most surgeons who perform this surgery want their patients to have a mental health evaluation beforehand to help make sure it is the right choice.
So, once again, nasty politics seem to stem from the clash of totalizing vs nuanced beliefs. "Gender reassignment is a mental disorder" "There is no mental disorder associated with gender reassignment"
And, 91% of all responding surgeons "would require a mental health evaluation prior to detransition."