A Japanese cyber-security expert who defended basic decency was stabbed to death
Often times I think we characterize trolls as normal people who just let out their anti-social side under the cloak of internet anonymity.  Probably that is even true for the majority.  But the scary thing we need to address is the number of isolated and devalued individuals subsisting in modern society, but without dignity.  Under the veneer of societal abundance, the struggle to survive is replaced with the pursuit of abstract accomplishments (career, sports, fame, etc).  When someone is not successful in these things, it's very easy to survive but not thrive, and in the absence of real survival pressure it's too easy to be left alone with ones thoughts and descend into a depressive downward spiral.