Islam and its opposition to Western materialism is what worries America most...

Another red herring. What the Islamic countries who oppose the policies and practices of the US and "the West" object to isn't how we practice materialism in our own countries. What they object to is the ways the governments of the countries of the industrialized West trample upon the human rights of the Islamic people of the Middle East, in their own countries. In other words, they have something we want. We think, because we're stronger then them, that we have every right to do whatever is necessary in order to get what we want.

Clint Keller's point is a good one. We're no better than common criminals. If our neighbor has something we want, we just take it. It doesn't matter to us how many people we have to kill, or how many lives we have to destroy (our own people as well as theirs) in the process.