The name is on this thread somewhere. I can't even remember who posted it, but it was last night!
Try this: the kid really was a pro-Bush conservative. The dad is a nutbar who somehow gives his kid up to the jihadis (lefties love to romanticize "revolutionary" types and maybe he gets a connection to them through ANSWER) figuring that they'd set the kid straight by showing him the "atrocities committed by the occupation" or some such garbage. He has Moore interview him before he goes and intends for him to interview him after he returns to show how the experience has changed him to include in the film. Of course the Islamofascists queer the deal by killing Nick and the dad is driven even further around the bend by guilt and grief and doubles his efforts to bring down Bush so that, in his own twisted mind, his son did not die in vain.