If you read all of that poll data you'll see the only people Americans are really looking to blame for anything are the gas (petrol) companies. 79% of Americans think the gas companies are taking advantage of the hurricane to jack up the price of filling up the Chevrolet. You can always count on the American public.
Okay, I was having a bit of fun when I wrote that last paragraph, but there's a serious side here too. The American public is not looking to find fault with anyone because (a) the situation is still grave and (b) most people probably believe everyone's doing their best, even if they're not doing a great job. The gas companies, however, are perceived to be cashing in on what is a national crisis, which explains why more people find fault with them than anyone directly involved in the relief effort.