1. Social media's objective function is engagement. Outrage and like buttons are highly engaging.

2. Tribalism + scale + time = two "us vs them" groups. Politically, FPTP voting mathematically implies spoilage; the Ron Paul example doesn't extol some virtue.

3. People are furious due to these (utterly preventable) things: https://www.youtube.com/watch?v=qEJ4hkpQW8E