Even if the government covered it up, wouldn't average people be blabbering to the press???
Besides, wouldn't a terrorist attack be more beneficial than a mechanical failure??? A mechanical failure would cause major overhauls of all Airbus 300 planes and destroy the airline industry. A terrorist attack would result in "tighter security measures". A terrorist attack would not destroy the insurance industry the same way as would a mechanical failure.
They did for TWA 800, but nobody cared to hear them. There were hundreds of people. Bill simply called them liars. Go figure.