What percentage of people who write such stories, collect such knives or watch an animal porn video once in their twenties do you think commit murder, Treehorn?
I'll bet the pre-tax annual salary of a teacher that the percentage of murderers among people that enjoy writing rape stories and/or that enjoy collecting and wearing flick knives between bouts of watch animal porn (to the point where their college activates a "monitoring" program in respect of them) is higher than the percentage of murderers among people that would never enjoy/ engage in such behaviors.