I can't read all that, my head exploded! Can't we just say they R dum!?!
The point is that they are not dumb, but that they have a culture that does not permit trust. The issue isn't a lack of competence at individual skills, but the inability to cooperate with anyone outside of the clan, tribe or unit. The individual Arab is not a bad fighter. In fact, they do very well in small group actions, especially in unconventional operations, but they cannot make the leap to conventional warfare. This is why they are easy to conquer but difficult to govern.