What past grievances? Just how does the U.S. alliance with Isreal cause Al Qaeda a grievance? Is it because we don't agree that Isreal should be obliterated? Occupation of the Arabian penninsula seemed readily acceptable when we drove Iraq out of Kuwait. Our presence in Saudi Arabia is quite acceptable when it keeps Iran out. If Saudi Arabia doesn't want an american presence in their country all they have to do is to refuse to sell us their oil and tell us to get out of their country. Let us know when you think that will happen.