Freedom
9/11 was just  another battle in the war between the US and Arabs which started with the US funding the takeover of land in Palestine. The sequence of events before and after did not need religion to  have them occur. There could be simple retaliation for retaliation. 

The invasion of Iraq was completely unjustified, an operation by radical fundamental Christians. Just like Vietnam, built on a lie. Simply a bully operation, costing thousands of lives, and a precursor to the current hopeless situation. Unfortunately it is a measure of the failure of our moral compass.  Islam is blamed to cover up our failure to recognize our own weakness.