Munger identifies Social-Proof Tendency as especially dangerous when it produces collective inaction. The murder of Kitty Genovese — where dozens of neighbors witnessed an assault and none intervened — demonstrates how “everybody looked at everybody else and nobody acted.” The pattern scales: in the “Serpico Syndrome,” named after the honest New York cop who found that virtually the entire department was corrupt, the rare individual who resists social proof faces retaliation from the very group whose behavior should be corrected. Munger extends this to corporate governance, noting that boards of directors often behave like the corrupt police rather than like Serpico — they see problems, observe that no one else is objecting, and remain silent.
Judith Rich Harris provided a complementary finding that strengthened Munger’s emphasis on social proof: peer pressure on children “is far more important, and parental nurture is much less important, than had been commonly recognized.” Her work, published from a position of extreme disadvantage — “kicked out of Harvard’s PhD program,” housebound by autoimmune disease — demonstrated that the social-proof environment children inhabit with peers shapes personality more than parental instruction. Munger wrote to Harvard urging them to award her an honorary PhD, citing Oxford’s gracious amends to Samuel Johnson.
The pattern connects to First conclusions become nearly permanent — the brain resists its own updates — once social proof establishes a group norm (whether corrupt policing or board passivity), Inconsistency-Avoidance locks it in, making the combination especially resistant to correction. It also links to Systems that prevent bad behavior beat moral appeals — design the cash register, not the sermon — Serpico’s moral courage failed to reform the NYPD from within; only structural intervention (external investigation) could override the social-proof equilibrium.