Those of you who are watching the video and not listening to the lyrics don't get it. Clearly Serj is no advocate of Bush and has stated so publicly. That said, the video and the song is clearly about how ignorant war is and I say that as an Infantry Soldier.
War is ignorant and that goes for both sides of the conflict. The attack on the world trade center was perpetuated by a bunch of childish, murderous thugs who have no life outside of murder and destruction.
The invasion of Iraq was overkill as a result of 911 and equally ignorant only not for the same murderous objectives (unless of course you are a "Bush is a war criminal" moron).
In short, I think you guys are thinking too much on this one. Serj is a brilliant artist no doubt, however, this song and the video is nothing more than an extension of his feelings that war is ignorant.