Much of the rest of the nation rolled it's eyes in disgust that people had to be praised for acting like responsible human beings.
That's one answer for your question.
If that grid went down someplace like, Newark, Camden, Trenton, or similar, you would have scenes like New Orleans. I think NYC already proved themselves to be adults on 9/11. There wasn’t a crowd control needed. Matter of fact, the control that was needed was to turn away volunteers. Everyone wanted to be there to do something.