OK to make it more clearly, their major goal is to protect La Grande Nation
I don't want to seem naive but I don't think it's the case.
We all agree I think so say that the judiciary investigation undermines the technical one. It's not due to incompetence but to a very rigid system.
As RAT5 says, having an international specialised agency would surely be a very good answer to this kind of problem. But honestly, which aviation authority, which government would dismantle its investigation branch, its transport safety board for an international agency. I think none is really willing to.
The subject on the french investigation/judiciary system should be closed because we can't (here) really change it.
Let's focus on the evidences or lack of evidences we have and take note that as far as I know, no one here can certify where the black boxes are right now.
Let's hope, in the name of safety, that this case is solved as quickly as possible.