If you haven't watched Spike Lee's multi-act video dissertation on the Katrina disaster called "When the Levees Broke", I highly recommend you do. It should be available for viewing at your local video store or at NetFlix or may show up again on HBO if you subscribe. It won't make you cry, but it will make you angry. It will also make you smile.
We cannot blame Katrina. Katrina was just the natural; it is mankind that was the disaster. Follow this link below for a short video about "Paradise Faded". It runs just two minutes, twenty seconds and is quite well done.