Among all the other duties he had to assign to his dwindling and unavailable "first responders"?
I'm not defending the guy, I'm just proposing that there's a lot more to the picture than "Nagin's a fool", which he very well may be.
But first and foremost he *clearly* had no cooperation from the Orleans School Board.
Probably true, and it's probably true he was short handed. I'd think he could have called the facility managers and asked them to get the gates open and and the busses ready, and asked for civilian volunteers to get them moving, but I don't think bureaucrats typically think that way.
So in other words, 'The Buck Never Got Here.'
The man probably means well, but he is very unsophisticated, has no common sense, and is struggling with a substance abuse problem. Good schmoozer, but no "there there," and he works with a staff that would have no problem with the casting director of the old Amos'n'Andy Show. If dead bodies weren't involved, it would be amusing to outsiders.
But the obscene, unwarranted, and stupid attacks on Bush, the internecine warfare with the idiotic Governatrix, and his failure to deliver, means this fellow should be written off. He ain't no Giuliani. In Chicago, he'd be a minor ward heeler, if that.