MtheGM, you said this:

small but determined group of Militant Islamists who themselves admit they are not concerned with American Imperialism, but declare themselves Koranically enjoined to impose by Jihad the Universal Caliphate"

I think that you have yourself proved my point. Clearly you are wrong to say they are not concerned with American Imperialism. bin Laden himself has said that they are (as I have repeatedly said in this thread, for which you have said I am not being rational). Even in the quote you have provided, bin Laden didn't say anything about a global caliphate. He was talking specifically about a caliphate uniting Muslims. He didn't say his aims were to convert anyone to Islam. He said uniting Musims, not creating new ones.

The quote you provided proves that al Qaeda's actions in the US are for the purpose of ending US imperialism in Muslim lands and nothing else. Their actions in Muslim lands may be for the purpose of uniting Muslims under a global caliphate, but not their actions in the US or other Western countries.