CP is shared with the intent of reciprocity for more CP; hence sharing existing CP promotes future CP.
Violent/hateful content is shared with the intent to encourage/persuade others to perform similar acts, or to dehumanize the victims.
CP, violent and hateful content are shared for a myriad of reasons, some for profit, like the documentary on the Bataclan attack on Netflix, some for sharing with fellow pedophiles. I don't see why I can't see 9/11 footage because someone else might feel different about it.
No, it should be based on actual research and statistics. For example, many supposedly reasonable people assumed that violent computer games promote criminal/antisocial behaviour, but they actually don’t.
That said, the sharing of the video in that thread is something I think we can all agree is 0’s and 1’s that should be attempted to be prevented.
The media will come and share these videos for clicks and that’s a separate issue. Initially, this guy is knowingly becoming an Internet celebrity for murdering people. This part of the culture has to be addressed. I am worried this kind of meme-heavy killing is opening up a sickening can of worms.