Seems to me that in this absurd statement he unwittingly gives credit to President Bush for us being stronger.
He could just as easily be talking about the extreme left.
The extreme left absorbed 9/11 and came back stronger.
Zippo has a habit of referring to the extreme left as “WE” as in “We are what you've been waiting for”.
My impression is he's referring to his administration absorbing an attack and coming back stronger.