Jersh: i think its because its harder to justify the progression from fetishizing death in a fictional way to fetishizing it in a real way than it is for pedophilia. Like, you can go from gore art to snuff films or watchpeopledie or whatever, but after that where do you go? straight to killing people yourself?? 
Jersh: I think theres more intermediary steps for pedo stuff, like loli hentai -> weird creepy cgi loli hentai -> videos kids upload to youtube on accident -> cp -> watching kids in the park touching yourself -> getting asked to watch your young cousins or whatever.