As I said in the other post, about a broke family man and a millionaire, maintaining security of property really does serve the greater good.

In addition, stealing affects both the thief and victim. The victim loses feelings of security, and is forced to waste time and resources protecting his property. The thief suffers from the curse of anyone who gains without legitimate effort - a weakening of his moral fiber, a lessening of positive motivation, and a loss of normality. His successes in life will be cheapened by the fact he couldn't make it without stealing.

Neither the first or second points above apply to something like New Orleans. And without a natural disaster, I don't believe that looting a store is OK to feed your starving children.