"I think for some reason he did not understand the full magnitude of this on the front end," Nagin said.
Nagin is saying this regarding Bush! When Bush told them to evacuate and they waited. Nagin is the one that didn't fully 'get it'. And he doesn't want interference from outsiders in rebuilding NO. Nagin's the one that should be out of a job. All he is good for is twiddling his thumbs and pointing his finger, IMO. Devoid of any leadership skills.
A mayor of a town with no people in it? I'd say he already was. He must think so as well, becaue he's moved to Dallas, bought a house and enrolled his daughter in school there.