Strauss and Qutub were ideological twins- puritans, at war with the liberal individualism. Strauss reckoned that a nation could only save its soul if it rallied to church and flag- and it could only be trusted to do that if it had an ENEMY.
The Soviet Empire was a dandy enemy. When it collapsed (having proved itself a lot less dandy than the neo-cons argued) a new Enemy had to be found. And there was Bin Laden just raring to step into Brezhnev's shoes.
The story of the past half century is the story of a struggle between liberalism and puritanism. Everything else- however epic- has been a distraction- a sleight of hand designed to take our gaze away from what was really going on.