It just occurred to me that anger is favored online because of a UX quirk. To build is complex; to destroy requires only a single bit! So the objects of our ire, those people, things and ideas we want gone from the world, those things that require only that we express our hatred and ill-will toward them, naturally become the most popular and shared content. As a corollary the people who are clearest and most concrete in their list of hates, the ones who constantly edit that list in real time according to audience response, they become the most appealing.
Isn't it then not very surprising that those who build prefer to do so in silence.