Yes - what is your assertion? I'll ask you then the same question I just asked Howlin' - do you think there was not enough warning given?
It was just a bad deal all the way around. Sufficient warning couldn't have been given since it was generally accepted that a full evacuation of New Orleans would take 72 hours, and Katrina gave even the experts less time than that, especially on its severity (the 10 am Saturday advisory was the first one that specifically mentioned the possibility of a Category 4). Couple that with a faster-than-expected approach, and you got what we got.
Where I could fault the mayor was in dickering with the definition of "mandatory" (it seems to give more power to the government in Louisiana than elsewhere), and then not using buses to start taking residents out of the city rather than to the Superdome. Beyond that, I can only fault the people that could get out but didn't.
That's the last time I try to break up a fight :-)