AFGHANISTAN AND IRAQ are the latest in a string of blunders that includes Vietnam and an unintended war with China from 1950 to '53, those four fiascoes being just the worst moments in nearly a lifetime of false urgencies, intelligence failures, grandiose designs, and stereotyping of enemies and allies alike. America brought down the Soviet empire at the cold war's most dangerous juncture, but even that victory was surrounded by myths, such as the...