It seems to me that the 9/11 events this year are more numerous and attracting much more media attention. One would have thought that after five years, the general public would have come to terms with what happened.
The conclusion I have drawn is that the state of things in Iraq and Afghanistan has led to the realisation that what was expected to be a swift and clean operation to deal with those behind the attack in New York is going to be a long haul. There can be no victory for a military solution and we are dealing with opponents who have nothing to gain from discussion and agreements. If anything, the terrorist threat is worse now than when we moved into Iraq. Sure, mainland USA has - so far as we the public know - had no more attacks but alsewhere US assets are fair game. Also, easy game.
This feeling that we are unable to deal with those who caused our losses increases the effect of the attack. It is not normal for an American citizen to feel powerless.