If someone tells another person to do something stupid, who is guilty?
The person telling them to do it. loving Christ it's not even a contest. If you think someone has the potential to do stuffty things, spurring them on to do those stuffty things makes
you the bad person. Chris-Chan likely wouldn't have done half the stuffty things she did if terminally online forgetwads didn't enable/encourage it. It'd be better for both her and the internet if she just faded into obscurity as a small-town weirdo.
KiwiFarms says they discourage direct interaction with the people they laugh at, but that's not really enforceable unless people on their forum brag about it. And being a public website, a sizable chunk of their traffic (and pretty much every public website) are people who aren't logged in/don't have accounts registered at all. Hell, the site didn't even have account registering enabled at the time of its shutdown. At that point it's not a rule. It's a request, and it's one that gets willfully ignored constantly.
Three people have committed Self Delete because of KiwiFarms harassment. They've exploited people with genuine mental health issues. They've literally investigateed people with malicious intent. They willfully hosted the manifesto of a Hardcore Gamer. They even hosted a Neo-national socialist site called Action Zealandia, which no one even knew was related to them until both sites went down at the same time.
I doubt KiwiFarms will truly go away without legal action. Realistically they'll probably shift over to Tor. But taking away their public platform is a good thing, whether it stays up or not.