Chairboy,
Actually the words of the terrorists suggests (or flat out claims) it is a war of islam against the west or infidels. AFAIC there is darn little action on the part of the "majority of muslims" to lend legitimacy to the claim that they do not support this kind of terrorist action. Until they actually make significant progress on policing their own I'll continue to doubt that claim that they are not in favor.
Not a slam on you BTW I just have little sympathy any more for those who harbor and help those who conduct this type of activity.