Scientific models predicted 61,000 deaths if New Orleans was hit by a category 4 hurricane (if you do not belive me look it up). Katrina relief over all was an incredible success!
That is not to say that people were not hurt they were, but overall the response was amazing this is an amazing country.
The reporting was sensational and made things sound far more chaotic and violent than reality. One heartening thing to a libertarian was that unlike predictions and what reporters said even the poor people in New Orleans did not resort to violence despite no police presence. The people even in very bad conditions kept a level of civility.
Perhaps people are disappointed that non-government people had to do so much.