The whole thing relies on the loose causality of stochastic terrorism. It's a bit like the Nuremberg trials "only gave orders" defense, except they're not even orders, just innuendo - it's just spreading smear material and a general attitude of hate among a fractious, isolated and angry audience.
A makes the post. B makes a fake phone call to the police. Cop C arrives and pulls the trigger. All in different countries. Is A really free of the repercussions?
Actual evidence of harassment from members of kiwifarms seems to be missing in all of these discussions. There is no doubt that there was lots of doxxing and lots of mean words on the site, but I haven't seen any evidence of harassment campaigns or anything similar. The closest thing that there was to evidence is someone who called in a SWAT team on a Republican congressperson and said to the police, "I am a kiwifarms mod, please come investigate me."
If that evidence existed, given the microscope this site was under, someone would have found it.
Nonetheless this has not stopped journalists from reporting it as fact so they can create via citeogenesis a bloody shirt to wave and justify campaigns against the KiwiFarms.