If I was there and was starving, I would definitely loot some food and water, just to keep going. I would pay for it if I could, but in most of these stores there is no one to pay, so it seems, so wghat else can you do besides just take it? Besides, most of the food would spoil anyway, and food is hard to find in New Orleans right now, so I would hardly fault anyone for taking it.
I would also try and get my hands on a weapon if I could, b/c New Orleans is basically hell right now, and anarchy pretty much reigns supreme. You would need something to protect yourself, Ideally, I would try to get a gun. A 9mm pistol would do fine.
I do think that the people that are looting TVs and things like that are a**holes, though. There is virtually no infrastructure left, so what the hell are you going to do with a TV if there is no power to run it?
I really feel bad for the people who are in the SuperDome, though. Conditions must be absolute squalor in there by now.