"I think there's a force that keeps drunken teenagers - most drunken teenagers - from crashing their cars when they're coming home from the senior prom or their first big rock concert. That keeps most planes from crashing even when something goes wrong. Not all, just most. Hey, the fact that no one's used a nuclear weapon on actual living people since 1945 suggests there has to be something on our side. Sooner or later someone will, of course, but over half a century... that's a long time."
(Кстати, Виктор Вебер перевел "senior prom" как "серьезный экзамен".)