Violent mobs organised through private channels by men seems to be more similar to what KiwiFarms are doing than what they are reacting to.
This seems like a fundamentally different scenario than the OP I was responding to, glad I asked for specifics ;)
"A person is smart. People are dumb, panicky dangerous animals and you know it." Humans are inherently tribal. If enough of us get together in a group, we are capable of terrible things - and the justification of them.