Big1,
I am struggling with understanding how you really feel. ;-)
I would agree that "Squaring temples might not be such a travesty", if the patient understands what may occur down the road and where that may leave him given his squared temples.
If the doctor squares the temples without informing the patient of the long-term consequences, then I could consider this unethical as the doctor may be doing it to guarantee additional business from this patient in the future. At a minimum, I would consider the doctor to be violating the Hippocratic Oath that says they will "do no harm...".
My two cents,
Mr. T