I almost forgot the positive. I remember that for even a few weeks afterwards, people even drove their cars more considerately of each other, were more tolerant of each other, were willing to accept one anothers differences in light of the fact that we were ALL attacked. Nevermind that you may live in Podunk Kansas or the backside of nowhere Texas, If for whatever reason you found yourself in NYC that day, and went up those Towers to enjoy the view, or conduct business, you were as much a target as those who were there! You were (and are) still a target by virtue of being who and what you are, an American!
In 1835, a year before the Alamo, the Presidente de Mexico General Santa Anna sent General Cos up to the city of Gonzales to confiscate a cannon that the king of Spain had given the settlers there for protection from the indians. It was a pathetic thing, only fifty caliber, and so old THEN that it was almost as much a hazard to a would-be gunner as anyone being shot at by it. When Cos and his army got to the ford at the Gonzales River, he saw all the men from town flanking the cannon, with a couple of volunteers to shoot it. A flag flew from a pole affixed to that gun, it bore a picture of the cannon, and the words "COME AND TAKE IT". If anyone hasn't got the idea after Afghanistan and Iraq, that we are serious about life, liberty and the persuit of all who threaten it, "COME AND TAKE IT!"