“Insanity in individuals is something rare; but in groups, parties, nations and epochs it is the rule.”Friedrich Nietzsche · Dincolo de bine și de rău · 1886 · Dincolo de bine și de rău, § 156
Individual madness is rare, but in groups it becomes the rule, as social pressure overrides reason.
Nietzsche observes that rational individuals, taken separately, can act irrationally when in a crowd. The mechanism is social: in a group, pressure to conform, collective emotions, and loss of personal responsibility lead to absurd or violent decisions. History is full of examples—from pogroms to financial speculative bubbles. A group can adopt ideas no individual would support alone.
Why it matters It helps you be skeptical of majority opinion and maintain critical thinking in collective contexts. In the age of social media, where waves of outrage spread quickly, it's an antidote to conformity.