I think it's not so much a problem with social media itself, but rather a phenomenon that occurs when consumption points converge. Anger is great for grabbing attention, and for newcomers trying to get noticed at a converged consumption point, generating anger or outrage is just the easiest way.

At first I thought it might be a problem with social media, but it seems more like a problem that arises when groups converge in one place. So these days, I just write my thoughts on my own homepage. That way I can write my own thoughts without getting angry at other people's posts.