Stereotype

"Bloodletting works sometimes" is not any kind of vindication of the historical procedure, though; the historical use of (and explanation of) bloodletting in medicine is entirely justified as being presented as the poster child for harmful and ineffective treatment grounded in utter nonsense.

(Hemochromatosis and severe acute polycythemia are not remotely common enough to justify the frequency with which bloodletting was prescribed, and post-operative venous congestion is a complication of clinical procedures that did not exist before the 1960s.)