Tribal bivalence
I wrote the following in a rather off-hand manner and found that I’d written rather more than I’d recognised I knew on the benefits of mobs and individual for the species:
Man is prone to witch hunts (and pillories and stocks and coventries, and…). Arguably the tendency toward witch hunts has been a significant contributing factor in the social binding and coherency that enabled our success as a species. We got the benefits of (assumed) individual intelligence and of herd/flock coherence, and that’s a pretty potent mix.