Well from what I have been hearing (from others, I haven't taken the time to watch it yet) Spike Lee's new documentary puts forth a CT I hadn't heard until now. That they stuck bombs in the levees and didn't send any aid for a while because the evil white gubmint wanted to wash out all the blacks from New Orleans. Of course Spike doesn't actually say any of this himself, he just does interviews with people who lost their homes who say this, that way he is "Just asking questions".