What surprises me is that no one has brought up nawlins. They have been under water for years. Not a problem, until you add in a hurricane. Despite the past destruction, they are still willing to pay the price. Are Jazz and Mardi Gras that important?
Perhaps they should take the lesson King Canute gave to his court about not trying to command Mother Nature.
No...it is the Port of New Orleans that is "that important", since the exports for probably half the United States (and especially agricultural products) passes through it. Cheaper to build taller levees than to replace the entire port infrastructure.