You do know that the Crusades weren't a US affair, don't you?
See my other replies.
The USA came hundreds of years later. The same principals still apply however. When you paint the Muslims as hero's and the Christians as villians you feed the propaganda machine.
They are just too PC to discuss the Muslim philosphy, political structure, and goals in any detail. I'm sure there is plenty of blame to go around but it is not presented that way at all.
(Even though I understood perfectly well what he was saying the first time. Basically, that by tearing down the West and portraying the Muslims as innocents in the documentary, this helps to effectively tear down the West's efforts today i.e. the US.)