(This is a philosophical question. Just exploring ideas)
Increasing number of people have nothing to lose. Rioting is pointless and dumb and can land you in jail. People publicly writing "bad stuff" on social media are risking jail-time or at least having their lives destroyed.
Why is nobody killing the rapists and murderers? Why is there no secret organization cleaning up the streets? Why are politicians and "public servants" allowed to feel safe?
I think this is a historical anomaly.
Who would you target? Who is the one big guy that is keeping all the bad stuff going? There isn't really anyone like that; it's more a cabal of mercurial figures convincing us to kill ourselves.
Violence does nothing when you yourself are the enemy.