It depends on who you really think is attacking America, doesn't it?

I think America's own political leaders and CIA and military-industrial establishment have been attacking America, and they have been doing so for, oh, at least the last 5 decades. They find their Osamas and Noriegas and Castros and Allendes and Saddams and Ahmadinejads out in the world...usually in countries that are physically quite incapable of directly threatening the USA...because they know that such symbolic and faraway "evil enemy" figures are needed to keep the American public scared, keep their eyes focused abroad instead of at the corruption within, and keep the public supporting the scoundrels who are sending their sons and daughters off to wars of choice.

In the same way, Hitler found Jews, Communists, pacifists, and other such scapegoats convenient. He also found the Reichstag fire very convenient...just as the PNAC found the 911 attacks. They had to have such an event, according to their own written planning statements on the matter, in order to effectively usher in "the New American Century". Perhaps Osama was on their payroll...or perhaps they just found it easy enough to open a few doors, turn a blind eye, and let his people walk through and arrange things in a most convenient way. Anyway, they got what they wanted. They got a frightened, angry public, and it allowed them to do everything they have done since.

Osama could not have worked better for them if he was on their payroll, and he continues to work well for them as long as he remains officially alive (?) and uncaptured.

Ahmadinejad, however, is the current reigning champion among offical "bad guys". Osama has long been displaced by first Saddam (who was no threat at all to the USA)...then by Ahmadinejad (who is no threat at all to the USA).

Saddam has been "got". He was no longer very useful after Iraq had been occupied, because the war was fought to occupy Iraq. Another war was fought to occupy Afghanistan. Both wars are still under way. Another war may presently be fought to occupy Iran. If so, I fear it will trigger a series of further disasters in the world that will be substantially beyond the scope of the PNAC's planning.