Kesa, the attack got attention because of the scale of the attack, and because of where it happened.
Please try to separate the event itself from the events that followed from it. 3000 people dying is not a small number. The issue many have with the 9/11 terrorist attack come from how it was used to justify outlandish actions (two wars, Patriot Act, Guantanamo Bay, etc...). This use of 9/11 is not the fault of the people who died, it is the fault of the politicians.
However, on the 10 year anniversary of 9/11, it is not the politicians we should remember, but rather the victims of the attack. I hope you understand why this is, if not then please ask.