There was a post here some time back from a National Guardsman whose unit was sent to New Orleans indicating that his unit had to deal with numerous cases of looting ... by NOPD.

I don't recall seeing any citizen complaints about the behavior federal or other out-of-state units, or even Louisiana state police. Every case I recall involved NOPD.

Katrina and New Orleans are special cases and can't really be compared to anything else. Remember that all of this mayhem occurred in an area hit by a minimal _Category 1_ hurricane: areas south and east that got hit strongly didn't have such poor official behavior, nor have there been such problems in other hurricanes in other states.