America is flawed. America is matierialistic. America is racist, isolationist, and a thousand other things.
America, however, is also free. We are free to be flawed, to be matierialistic, to be racist (inasmuch as it doesn't hurt anyone else), and free to be an isolationist country, for better or for worse. We are free to choose which religion we worship, be it islam, judeaism, christianity, atheism, buddhism, wiccan, or discordi(fnord)anism. We have the choice to do what we want. Now if a person disagrees with these views there are ways for people to opine without causing mass destruction in acts of cowardice.
Now I agree with you, the men on those planes were not cowards. If they had been American men carrying out an order from their government, orders in which they would sacrifice their lives for their country. These men would be martyred and remembered through the history of our flawed country. The men on the planes that flew into the World Trade Center were not cowards, the were brave. The act itself, of a group of terrorist striking our world trade center and not identifying themselves. It is an act of cowardice to run up to somebody, hit them, and then run away and hide and not face the aftermath of your act.
Those terrorist on the planes either had a lot of bravery or were mindwashed. The terrorist that planned the attack are utter cowards not to own up to their act.