Indeed. But we are talking about people who are arguably insane. I don't want the issue being decided solely on that basis any more than I want the issue of religious freedom decided on the basis of the existence of people like Jim Jones.
I'm talking about normal people that get caught up in it, as well as serial killers. They are insane, but "normal people" can become damaged by viewing disturbing images.
There has always been hard core pornography, but it was kept hidden from the general population. I don't know about court deciding what is bad and good, because frankly I don't think they could find their rear ends with both hands.