Humanity’s greatest scourge is groupthink. Millions have marched off to war, convinced of their side’s goodness and the enemy’s evil, and didn’t come back or came back in coffins. Billions have embraced politics and political philosophies with warning labels for anyone who cared to look: destruction and death sure to follow. Against the death toll from groupthink, the Black Plague, Spanish Flu, cancer, heart disease, and every other human malady shrink to insignificance.

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