This is what you get when you saturate society with alarmist propaganda 24/7.
There’s always some latent nutcase that the propaganda draws out in some way. Having become completely hypnotized by the reckless fearmongering, they take it upon themselves to punish the rule-breakers. In this case it’s arson. It can very easily be imagined that more than a few Karen murders will take place before all this is over.