Here's a great backgrounder on the disaster "planning" in New Orleans which explains a lot about the grim result.
The evacuation plan was a plan, but it was really just a ghost plan with ghost buses and ghost drivers, with ghost emergency supplies kept in ghost "shelters" under control of a ghost police force with a ghost emergency communications system overseen by a ghastly governor.
It was a plan for a ghost town. That plan worked.
And here come the ghosts.