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Conforming to group consensus at the expense of critical thinking. Everyone agreeing doesn't mean anyone is right.
Leads to poor organizational decisions, suppresses innovation, and explains why diverse teams often outperform homogeneous expert teams.
Groupthink contributed to major disasters like the Challenger explosion and Bay of Pigs invasion - smart people making terrible collective decisions.
"Your confidence in your own rationality is inversely proportional to your actual rationality. Ironic, isn't it?"