I'm referring to the significant percentage of the population who believed conspiracy theories around vaccines.

And then what I saw was media personalities intentionally fanning the flames (e.g. Rogan) because they understood creating cultural rift us-them war out of a nothingburger was a way to maximize engagement.

Ideally we'd all be so rational we would have no us-versus-them instincts at all, and could be completely objective and form independent opinions on every issue based on data. But it's very clear that culture has a bit of a mob-mentality, and it's an open question whether we'd be better off with more or less coordination/restriction on our communication.