"In the cozy den of the large but modest house in Omaha where he has lived since he started on his first billion, Warren Buffett watched the horrors of Hurricane Katrina unfold on television in early September 2005. . . . On the fourth day, he beheld in disbelief the paralysis of local, state, and federal authorities unable to commence basic operations of rescue and sustenance, not just in New Orleans, but in towns and villages all along the Gulf...