You display no clue about French legal process, yet choose to be critical of it.
The question of a "crime" or not is not relevant. I explained earlier that when a life has been lost, the "Procureur" for the relevant district opens an "instruction" I explained this in an earlier post ( Iwould quote the post number, but because of deletions, the number keeps changing)
Here 150 lives were lost.
The Procureur (please note the different vocabulary; "Procureur" is not the same thing as "prosecutor"), is obliged to open a case and be open with the public and with all concerned parties.
The Procureur is not investigating the technical aspects; BEA do that. They brief him, and he applies his required public duty to what follows.
He does not have "gut feelings" and as such they are neither subjective nor not so.
Just to be clear, because you seem not to have grasped it. When a death has occurred, the Procureur opens a case. It does not ergo facto mean that there is a suspicion of a crime having been committed.
The, in due course, BEA investigations and reports become part of the "instruction"
Got it now?
Thanks for the patronising reply.
In which case he doesn't need to pass subjective judgments as to what is "likely" to have happened does he? Thought not. Got it?