I suspect porn has not killed a single person in the last five thousand years

Not a single person has died from porn. Millions have died from religion. Porn has been around since cave man times and no one has ever died from it. In the same way horror films, comedy films, sci-fi films, romance films and so on do not harm people. Porn is just entertainment. What harms people is alcohol, drugs, gambling, smoking, overeating and religion. Rather than worry about porn you should worry more that when you see school children walk home from school it is not uncommon to see them smoke, drink alcohol or even smoke weed.