Cory Doctorow put it more eloquently in Pluralistic: Predicting the present:

And while Americans shoot people they've only just gotten angry at, they also sometimes plan shooting sprees and kill a bunch of people because they're just generically angry. Being angry about the state of the world is a completely relatable emotion, of course, but the targets of these shootings are arbitrary. Sure sometimes these killings have clear, bigoted targets – mass shootings at Black supermarkets or mosques or synagogues or gay bars – more often the people who get sprayed with bullets (at country and western concerts or elementary schools or movie theaters) are almost certainly not the people the gunman (almost always a man) is angry at.

One day, as I was swimming in the community pool across the street – a critical part of my pain management strategy – I was struck with a thought: "Why don't these people murder health insurance executives?" Not that I wanted them to. I don't want anyone to kill anyone. But why do American men who murder their wives and the people who cut them off in traffic and random classrooms full of children leave the health insurance industry alone? This is an industry that is practically designed to fill the people who interact with it with uncontrollable rage. I mean, if you're watching your wife or your kid die before your eyes because some millionaire CEO decided to aim for a $10 billion stock buyback this year instead of his customary $9 billion target, wouldn't you feel that kind of murderous rage?

But the assassination of Brian Thompson is a wake-up call, a warning that if we don't solve this problem politically, we may not have a choice about whether it's solved with violence. As a character in "Radicalized" says, "They say violence never solves anything, but to quote The Onion: that's only true so long as you ignore all of human history".