Getting out of town would’ve meant leaving their “stuff” behind. Not that their stuff was worth keeping but it was “theirs”. To leave town would mean getting off their collective rumps and doing something different with their lives.
Some have seen that leave NOLA has gotten them on with their lives.
I recall the day (1960s)when the National Guard would be used to keep order and looters would threatened with being shot instead of having the police among them (looting while in uniform!).