In Ralph Peters book "Beyond Baghdad" There is an instresting artilce called "Hidden Unities" that adresses this question. If you do a google search you can find it in PDF form. Well worth the time.
On another hand, 80% or more of Muslims don't ACT on those interpretations. They live normal from our point of view lives.
I understand what your saying. Many of the elite in the Islamic Movement I'm sure are not your average Muslim worshiper of Islam. They would be in positions which would serve the movement politically, economically and spiritually. Look at the Muslin Brotherhood and its varius spin-off's such as Ha mas just to name one of many scattered throughout the world excluding some Arab nations where they are banned. We know their intentions why entertain them or give them any kind of legitimacy? Some problems are understandable but when politics obstruct the obvious there is no excuse.