Insurance companies save money by denying claims on a normal day. Paying to rebuild an entire state would jeopardize the big number going up and thus executive bonuses.
They won't be paying claims. They're not going to pay to rebuild a house that their models say will be knocked down again in 2-3 years by the next "storm of the century." Insurance companies exist to extract wealth, not to help people. And they will always have more lawyers than you.