OUR CONTRARIAN QUESTION—What important truth do very few people agree with you on?—is difficult to answer directly. It may be easier to start with a preliminary: what does everybody agree on? “Madness is rare in individuals—but in groups, parties, nations, and ages it is the rule,” Nietzsche wrote (before he went mad). If you can identify a delusional popular belief, you can find what lies hidden behind it: the contrarian truth.