What is the werewolf, if not a metaphor for the worst in human nature, our inner beasts freed and asserting their dominance? And those beasts are sneaky. They will, like compressed air in a tire, take advantage of ANY excuse, any opening, to escape. Even if the human in question is able to reassure himself that he is acting in the cause of ultimate good. Even if he convinces himself he is acting for God. The Spanish Inquisitors have proven to us that some of the worst atrocities of which people are capable have been performed in the “service” of the Almighty.
In Argentina, a teenage girl was having “visions;” in all likelihood, she was suffering from schizophrenia or some other mental illness (if the allegations about her experiencing visions are even true). Her ignorant, superstitious friends and family, at the insistence of the family clergyman, decided to perform an exorcism. With a knife. Now, if we accept as a premise that demons exist and do on occasion possess people, what those demons invariably WANT is to cause injury to the possessed. Do you think they care whether or not that injury is delivered by an outside agency? And if the motives of those makeshift exorcists were so pure and holy, why were there injuries to the girl’s genitals? The inner beasts seized upon the excuse to get their rocks off. Simple as that.