The Arab world is a completely different environment to European countries. In WW2, close to 100% of the adult civilian populace of the warring European countries were militarised. Furthermore, sans small pockets of resistance, national identities and warring countries were very clearly defined.

Arabic nations on the other hand are much more of a clusterfuck, and as far as I'm aware, dividing enemy countries down religious/tribal lines is a tactic routinely used by the Allies in Iraq.

What I'm saying is that whilst in WW2 the civilian populace were militarised with clear identities, the Middle East is a much more delicate and complex situation, requiring a lot of sensitivity. It's so ridiculously important that civilians in Ally-occupied countries do not feel that they are the enemy of the USA, and that the USA is on a crusade against Islam. Were that to ever happen, all US interests in the Middle East would be permafucked IMO.