The term heroic is misused. It is now a ballplayer who hits a single at the right moment to a boy scout helping an old lady.
After 9/11, NYC immediately ran smoothly.
New Orleans, even LA with the riots, proved that such is not the natural order of things. It requires the right leadership.
Highly competent leadership in a time of great stress and anxiety is rare...and considered heroic.
The City also ran very smoothly in the aftermath of the infamous blackout of August 2003 -- and I'd hardly consider Michael Bloomberg a "heroic" or even "highly competent" mayor.