Contact states large metal vehicle door trim came off while driving, unknown if accident was caused or other damage to surrounding vehicles. Further states, noticed when large rubber-like molding under door trim was flapping and thunking against door. Contact says water now intrudes into vehicle cabin and suspects constant water inside door affecting door electrical systems. Dealer notified by contact and no remedy provided for this "known issue". Contact is concerned about other trim pieces coming off and penetrating other vehicles at speed with "sharp and pointed edges", as well as electrical fire from water intrusion corrosion. Contact demands further investigation and action by vehicle safety regulators.