Of all the amazing, Le Carréan details surrounding the case of NSA leaker Edward Snowden, the one that seems to shock the most people is that all of this troubling, top-secret information was available to him, a 29-year-old high-school dropout who worked as a system administrator at private contractor Booz Allen Hamilton, and had little in the way of traditional accomplishment. "He isn’t a seasoned FBI or CIA investigator," Slate's Farhad Manjoo wrote in a column that was typical of much of the sneering surrounding Snowden's credentials. "He isn’t a State Department analyst. He’s not an attorney with a specialty...