Well how is it that you can legally have a video of two dudes stabbing another guy to death, chopping his head off and eating the body, and yet in some countries like US you can actually go to prison for longer for possession of child porn than for actually abusing a child sexually?

This does not make sense. A video of a crime != crime. And no, I am not defending pedophiles - but I am defending the stance that you should not be sent to prison for any kind of video you might have in your possession, as long as its not a video of you committing a crime,in which case, well, it's just an evidence against you.