American foreign policy is based on deep convictions. Those who shape it believe the United States is the indispensable nation that must lead the world; this leadership requires toughness; and toughness is best shown by threatening or using force. Beneath these beliefs lies the assumption that the United States knows more and sees further than other countries. Many liberals embrace this dogma. That makes sense. It emerges from the liberal tradition, which imagines that humanity is steadily...
