Xeni Jardin at BoingBoing quotes Ned Sublette:
The poorest 20% (you can argue with the number—10%? 18%? no one knows) of the city was left behind to drown. This was the plan. Forget the sanctimonious bullshit about the bullheaded people who wouldn’t leave. The evacuation plan was strictly laissez-faire. It depended on privately owned vehicles, and on having ready cash to fund an evacuation. The planners knew full well that the poor, who in New Orleans are overwhelmingly black, wouldn’t be able to get out.
The resources— meaning, the political will —
weren’t there to get them out.