If this crash was the result of a bomb (as the French media asserts), it is absurd for the authorities to claim the investigation "has to run its course." If they have sufficient evidence that it was a bomb, then it becomes primarily a criminal investigation, in which case the information should be released by law enforcement without the full press of an accident investigation.
The accident investigation should continue, of course. But, in parallel with the criminal investigation.
At least that is the way it would work in many countries, including the U.S.