Tell us about please. Your experience seems to be vastly different than mine. The disasters i have been in were all testimonies to politeness and neighborhood cooperation.
The street I lived on was all cooperation - but it didn't last long enough for anyone to go hungry. The emergency rooms were overflowing IF you could get there at all, and there was nowhere to get food or water. An emergency that only lasts a few days is VASTLY different than one that lasts a week or more.
I worked at the FEMA center for months after that. It was anything but civil. We had armed guards for very good reason, and I have never seen such filth in my life as from the people camped outside.