Be it Aribert Heim, Marcel Petiot or Shirō Ishii - why do you think many of the worlds sickest doctor serial killers were male gynecologists?

Do you think it coincidence that many of the worst cases in history of doctors who have tortured other humans were male gynecologist? And the question is... which one led to the other?
Be it Aribert Heim, Marcel Petiot or Shirō Ishii - why do you think many of the worlds sickest doctor serial killers were male gynecologists?
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