Finally someone in authority, in this case, Gov. Andrew M. Cuomo, is talking sense about rebuilding storm-damaged properties in New York City and on Long Island. In a meeting in Washington, D.C., on Friday, Gov. Cuomo outlined his idea that as much as $400 million of Hurricane Sandy federal aid be set aside for buying flood-zone houses made unlivable, knocking them down, and leaving the properties vacant. The concept is a welcome antidote to the rebuild-at-any-cost approach, and, if carried through, would save money — and lives.