Found an interesting BBC article on the Irish potato famine. There are some parallels with the disaster in New Orleans:
It was a natural disaster made worse by government inaction:
The Great Famine in Ireland began as a natural catastrophe of extraordinary magnitude, but its effects were severely worsened by the actions and inactions of the Whig government, headed by Lord John Russell in the crucial years from 1846 to 1852.
The prevailing political ideology of the English ruling party idealized laissez-faire capitalism. Relief efforts were seen as creating an unhealthy dependency on the starving Irish, violating the notion that individuals should be self sufficient and dependent on their own efforts, never to rely on government aid:
Laissez-faire, the reigning economic orthodoxy of the day, held that there should be as little government interference with the economy as possible. Under this doctrine, stopping the export of Irish grain was an unacceptable policy alternative, and it was therefore firmly rejected in London, though there were some British relief officials in Ireland who gave contrary advice.
The influence of the doctrine of laissez-faire may also be seen in two other decisions. The first was the decision to terminate the soup-kitchen scheme in September 1847 after only six months of operation. The idea of feeding directly a large proportion of the Irish population violated all of the Whigs' cherished notions of how government and society should function. The other decision was the refusal of the government to undertake any large scheme of assisted emigration. The Irish viceroy actually proposed in this fashion to sweep the western province of Connacht clean of as many as 400,000 pauper smallholders too poor to emigrate on their own. But the majority of Whig cabinet ministers saw little need to spend public money accelerating a process that was already going on 'privately' at a great rate.
Finally, the Irish were believed to have brought the famine on themselves as a consequence of their moral deficiencies:
Finally, we come to 'moralism'-the notion that the fundamental defects from which the Irish suffered were moral rather than financial. Educated Britons of this era saw serious defects in the Irish 'national character'-disorder or violence, filth, laziness, and worst of all, a lack of self-reliance. This amounted to a kind of racial or cultural stereotyping. The Irish had to be taught to stand on their own feet and to unlearn their dependence on government.
See:
http://www.bbc.co.uk/history/state/nations/famine_01.shtml