Mass shootings are planned, they’re not spontaneous, spur of the moment decisions usually. As such, it’s not just being angry. Anger is hot but burns over quickly.

You’re looking for someone who resents. Someone who’s been made to believe that they are owed something in life and are mad as hell they didn’t get it. Someone who’s come to realize they’re disposable and wants their promised piece of the pie. Resentment is something that has to grow and be nursed. It has to fester, which means it can be directed.

Politically, we’re at each other’s throats. Conservatives demonize liberals. Liberals blame conservatives.

The reason you don’t see attacks against the proliferators is because it would have to come from the left. You just don’t have that level of authoritarian dogma that leads to a sense of entitlement on the left in the same way (I’m not saying liberals aren’t entitled. I’m saying it manifests differently). Liberals don’t demonize Conservatives in the same barbaric manner; conservatives haven’t been falsely accused of running trafficking rings to eat small children stolen from Asia, for example.

So, conservatives are fostering a sense of entitlement that leads to long term, festering resentment and providing a place for it to land.

Again, this is not to say that it can’t go the other way. It just hasn’t as of yet. However, the recent near attack of Brett Kavenaugh may signifying a change in the status quo. It’s not like the left doesn’t have their own angry young men. They’ve just been mad at Capitalism. How do you shoot capitalism? So they’re anarchists mostly and use the cover of protests to attack "capitalism".

I do think we’ll see more attacks targeting the right with the continued stripping away of civil, voting, and reproductive rights. There’s a more specific target now. Certain authoritarian/fundamentalist elements have painted it on themselves.