I really am a conpiract theorist. I don't doubt for a moment that there were rich people left behind for dire in KATRINA. Most of the residents left behind, or in New Orleans anyways, were prodominently poor. Think about this though, those who evacuated before the hurricane and those who had the financial resources to get back on their feet have for the most part. There are still some who haven't and the way the recovery is going they may never have a permanent home.
There's also no doubt that the local and state governments have to take their part of the blame. The biggest problem is that emergency services (local state and federal) rely on the National Hurricane Center for knowing what destructyion a hurricane may bring. 48-72 hours before Katrina hit, i had threatened to be a Category 2 possibly major category three. We were told the levees could hold back a category three. Instead, Katrina srpassed Cat 2, Cat 3 and Cat 4 status, becoming a catastrophic Category 5 hurricane. Thank god it only mae landfall as a category three (or so says the National Hurricane Center after assessing the damage in New Orleans, which was hit by the less powerful west side of the storm).
What I'm getting at, there's improvements that needto be made all around. They need to get better forecasting technology into the NHC/NOAA. I'm sure they can predict what a storm can do if I can and NBC Weather Plus can come more accurate on landfall targets than the NWS.
Look up Microcast and ESP:Live when you get the chance. These are tools that are only on Weather Plus and MSNBC. Very accurate forecasting tools. National Weather Service largely relies on WSI (This is what CNN turns to).