What separates stereotype from common sense?

Data, real data.

Yet it’s harder and harder to get it.

Math is foundation of human civilization, data is mother of every decision.

Yet how many really understand stats, economists and biologists use often, yet they normally don’t understand it at all, or worse screw stats to fit their biased conclusion. Scholar ionnidis wrote about this issue famously.

Poll is even worse, because elites control polls, and they always have political agendas.