BB. In today's litigious society, it doesn't take much for a smart lawyer to turn an honest mistake into a culpable act.
Juries aren't experts, neither are judges.
Do you really want a panel of non-aviation types listening to your CVR, not having a clue what it all means, and having to decide if what they are listening to constitutes a criminal act, or an act with civil liability?
Witness the Egyptair disaster. Full CVR and Flight recorder readouts available, and they are still arguing over what happened.
CVR's were introduced solely as an accident prevention measure. They should be kept as such.