We can't fix this problem by somehow immunizing the population against abuse. Words hurt, and they hurt some people more than others. The only way to fix this is to hold those who abuse others accountable for their actions, as well as those who enable them. This is no different from harassment and stalking in real life. Those are already punished by law. The problem is the law is behind the times, and harassment on the internet is still largely something people get to do with impunity.
KiwiFarms exists thanks to Cloudflare (Domain, DNS, DDoS protection) and FiberHub (colocation), who provide services to them and refuse to do anything about the abuse perpetrated by this customer. KiwiFarms isn't even some darknet site; they are openly hosted in the US.