New Orleans is not your run of the mill city. Just take a look at Rudy Guilaini's response and nagin's.
New Orleans has always been a cesspool of incompetance and corruption.
You're denying reality for politics. Rudy Guiliani had to deal with a small portion of Manhattan while the rest of NYC and adjacent communities were fully functional. All the infrastructure was still in place. People were back at work downtown a few days after 9/11. With the exception of those killed in the attack, most other citizens were able to walk away and eventually find a way out of NYC. Local hospitals were prepared and waiting for wounded which never came. Police, fire and ambulance services were still functional. Most of all he had electricity and was able to make frequent TV and radio broadcasts througout 9/11 and subsequent days. On top of that Rudy was a great leader unlike Nagin and Blanco. However there is no comparison in the events you are attempting to equate. One is localized at one small part of Manhattan Island and the other covers 90,000 square miles. One killed 3000 people and created havok but there were no survivors to feed and evacuate. The other you had hundreds of thousands of people who needed water and food and evacuation. In one case, the people needed directions on how to get out of town and they needed hope. In the other, people needed the basic necessities of life and they needed rescue. In New Orleans you dont walk two or three miles and catch a ferry or train out of town.
In your rush to standup for Bush you overlook the fact that the FEMA Director is totally incompent and needs to be fired. Unless Bush dumps him, he's going to drag Bush down. If he's not fired, look for Bush to name someone to a position above him so Brown will disappear into oblivion.