The only legitimate hurricane plan for a city that lies below sea level and is surrounded by water is: everyone get the hell out!
Everything else is t**s on a boar. So the question is, who should be ultimately responsible for getting the people out (at least those unable to move themselves)?
According to the OFFICIAL PLAN posted on the State of Louisiana website (unless they've taken it off--not impossible), the MAYOR was responsible for moving people out of the city. Not that everyone would have wanted to go (some wanted to protect homes from looters; others wanted to loot), and some couldn't, because they were expected to stay and help with the aftermath, emergency responders etc.