“The illusion of feeling well-informed... a public that feels informed in proportion as it is to befuddled. In one of his characteristic pronouncements, at a press conference in May 1962, John F. Kennedy proclaimed the end of ideology in words that appealed to both these public needs-the need to believe that political decisions are in the hands of dispassionate, bipartisan experts and the need to believe that the problems experts deal with are unintelligible to laymen.”