We often wonder how people of the past, including the most revered and refined, could have universally engaged in conduct now considered unconscionable. Such as slavery. How could the Founders, so sublimely devoted to human liberty, have lived with — some participating in — human slavery? …While retrospective judgment tends to make us feel superior to our ancestors, it should really evoke humility. Surely some contemporary practices will be deemed equally abominable by succeeding generations. The only question is: Which ones?