Hiyas
It is the loss of life in those attacks. When trying to reason a US response should be. Ratchets it into a response of War against terrorism, without any compromising. If it were a few deaths and downed buildings. US options considered would most likely be less severe. Not a revenge motive, its a response to someone trying to kill you.
The people killed the way they were attacked. The supposed reason by the terrorists. The provagation the US has supposedly had done to the terrorists is non-existent. For all their beliefs of martyr and heroism seen by their comrades in US's eyes is irrational.
It will be those who have died to push the US into this War on terrorism. It will be our own survival that we'll be fighting it. A good start is formation of thousand man firing squads. The idea of a body being shot a thousand times, mangeled beyond recognition as a human form. Terrorists may rethink their afterlife, theres no use for red blobs shoveled up into plastic bags were they think their going.
Bronto