> It's a base, mob instinct that has caused riots, factionalism, witch hunts and genocide all throughout human history
This is it. In the last 10 years or so mob instinct has shown up in many ways - in looting stores, in doxing people and cancelling people who say the wrong things, in trying to overthrow governments, or just simple pile-ons. In part this has been fanned by big tech, but not entirely
The trick is tackling the causes of the creation of the mobs. "You're either with us or against us" is not new - Clinton and Bush were using it 20 years ago, but Cicero used it in Rome and it's in the bible. Big Tech is certainly a key part of the creation and expanse as it connects people, and people are encouraged to "pick a side". In traditional discourse what you'd say to your sportsmates up the pub could be a very different conversation to what you say to your collegues at an awayday. With social media, what you say to one, you say to all -- walking between worlds is difficult.
You might agree with group A on one thing (say housing), and group B on another thing (say BLM), and group C on another thing (say economy), but if those don't all align with your side, you won't fit in.