Does anyone truly believe that sadists are totally unable to control their impulses? In fact, forget sadists... do you believe that there is any sort of person that is completely unable to control themselves from acting on their first instincts?
I'm going to preempt people who will reply by mentioning schizophrenics. I don't pretend to be an expert, but my understanding is that schizophrenia doesn't control the person's actions, it just gives them a warped perception of the world. You'd probably react the same way if you truly believed that aliens were crawling out of the heating vents to control your brainwaves through your alarm clock.
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