The reason that evil triumphs is that "we" allow it to. This clip illustrates this point about war. The war that the clip is critiquing was the "good" war–WW II. I have not seen The Americanization of Emily, I will.
While this not a particularly well done documentary, it is an interesting watch because of the subject matter. While Chomsky would disagree with my characterization, what Chomsky is talking about is Babylon. Come out of her while you can.