Are you sure? I don't see any discussion or examples of normal people being inspired to criminal acts by pornography. It all seems to be about the serial killers.
I'm very sure. It's not just "criminal acts", it is the gradual desensitivation of the individual watching the movies, and reading the novels. It puts ideas in your head, that maybe would never occur to you. Swinging isn't a crime, but the parents of Danielle Van Dam were swingers. They didn't watch their child carefully enough, because they were too busy gratifying their sexual urges. How about threesomes? How do you keep a marriage and family together when you indulge in these kinds of sexual practices?
I'm not a prude, but a line has to be drawn as to what you will do regarding sexual activity.