You have the wrong standard of proof. Boeing and the FAA should be erroring on the side of caution, not hiding behind innocent until proven guilty.
And in case it's not totally clear, the caution should be for the passengers, not shareholders.
> "its AOA sensor was known to be faulty."
The plane was what, two months old? It should have been non-lethal even if a troop of rabid baboons was hired to maintain it.