interesting logic, but i still disagree. based on what you said, we shouldn't respond to attacks by others, instead we should mourn peoples' deaths and ignore the attacks. then we let several years pass and let several thousand people die and then the terrorists will finally give up because they will have no more support? i guess it's possible, but i would prefer thousands of innocents not die.
also, your logic begs one question (IMO): should the U.S. have declared and made war with Japan after Pearl Harbor was bombed on 12/7/41?