I guess the old addage has never been truer: "History is Written by Victors"
Looking at the Wikipedia article you linked, I don't see any definitive, authoritative sources of information that directly links KiwiFarms and these horrible events other than random tweets posted by people on the internet.
After looking through 5-6 different sources cited in the bottom of the article, I don't even see any references or screenshots of the actual website used in reporting, just journalists taking what other people are saying as fact.