Hey Curtis,
No offense taken although the dog wants to be paid off with cookies.
Your discourse reminds me of Ted Bundy - he said porn magazines led him to be a serial killer, in hope of getting off death row. You're right, the typical rapist, etc., will have a predisposition to these things. Leopold and Loeb, Ng, Daumler, etc..
It is the atypical that concerns me: the individual with a 14 year old intelligence level that watches a TV show about snuffing the homeless, who then goes out and douses someone with gasoline; the dough heads that try to do stunts they see in movies,
That said, I still don't understand the appeal of snuff stories, torture vignettes that are not part of a larger work, nor do I understand the appeal to the sci fi body remodification that creates women with 78 DDDD mammaries.