The civility has been illusory the whole time, but now we're heading well into the territory where people don't believe in it anymore.
Throw in people being killed, losing loved ones or otherwise losing everything to climate disasters and predatory insurance companies and you've got a lot of people who are angry, radicalised and convinced that nothing in the system can deliver them justice.
And now something anarchists like to call "propaganda of the deed": assasinating an unsympathetic target