The NTSB's job is to prove why it is safe to fly.
If they need help, the FBI and CIA are there to assist. The real potential of catastrophic economic collapse due to airliners falling from the sky is a matter of NATIONAL SECURITY.
Truth is always sacrificed in the name of National Security.
That's the answer to TWA 800, this, and other 'spontaneous' aircraft accidents.
I am sure you are right and it's just as I suspected.