Sad to say, it's the lawyers that will end up doing the most to prevent the truth from coming out. When it's a no-blame culture and everyone wants to find out what happened to prevent it from happening again, there's every incentive to be honest. When the ambulance-chasers get involved, everyone is defensive and may be reluctant to reveal the important information lest it open them to a lawsuit.
I would say the legal profession, especially in the US but increasingly elsewhere as well, is one of the bigger threats to safety of flight.