I would cynically guess that it is because the original event is irrelevant, and now used as an emotional patriotic excuse.
Still, I have read somewhere that even that vague declaration is not vague enough, because most of the persons that aided the terrorists are dead already. Basically, most of of the people that organized 9/11 attacks are dead now.
So USA will have to redefine the declaration, most probably.
Re:The NSA is Commandeering the Internet
by PavlovsCat on Thursday August 15, 2013 @11:18AM
(#6218316)
why is the declaration so vague?
So it can be forever.
Oops, typo! Thanks, fixed
And why is the declaration so vague?