Here's the difference: Most of the barrier islands are PUBLIC beaches. Everything below the high tide mark/primary dune is public land. Millions of people travel to them every Summer to swiw, boat, or just lounge in the Sun. They are an integral part of the state's economy.
Are you ready to open your river property to the public? Then the state isn't interested in your plight.
Is the erosion of your property creating a hazard to navigation? Then the federal government isn't interested in your problem.
Do you have a public beach on your property?