I don't currently own a gun. If this list came out where I live I would go out and buy one and demand that the newspaper update the map to show me as a gun owner. Between a criminal wanting to possibly steal a gun or looking at me as a "soft target" I would choose the former. Criminals can get guns on the street. They don't need to break into strange homes to get one.
People in this map area who show as non-gun owners should buy in mass and sue to keep the map constantly updated.