People with certain types of mental illnesses (and as someone with a type of mental illness, I clearly am not referring to everyone) are the ones who take things like this that far and that openly. Normal people can be cruel vicious assholes, but even on the internet they will have limits and boundaries. The thing is that these people are influenced by society. Their extremism is very much influenced by societal values and undercurrents
Most of that is true, but that's an utterly different thing from what most would mean by mental health. You're talking about anti-social patterns in behavior. That was my point. I made an earlier post describing similar ideas to what you're saying here. Citing a correlative pattern as though it were a causative one is simply dangerous.