Incidentally, Robert 'Mars' Kagan is a founder of 'The Project for The New American Century'. So no, Kagan isn't simply an eminent US political scientist. He's more importantly a founder of the PNAC.

So, Wolfowitz delivers the idea of 'pre-emption' by ditching 'containment' (an idea which even Bush Snr. rejected), the Bush clan rigs the election, Rumsfeld sells it to the Pentagon and Kagan sells it to the anglo-american 'academic' establishment. And they planned it all at Camp David in September 2001, legitimizing it all with this.