They didn't have anything to lose, so just set up a tent city. Because that's not a proper way of government housing. Let them Sit there, wherever they are, and if they want help they can ask nicely. I haven't heard one report of a Katrina survivor saying "thanks" for all the work that was done. It may have flown under the radar of the news media though seeing as I haven't met any of the survivors.
Like Debonair said, there wasn't much before, why should it be any improvement now?