The CVR would provide very strong evidence of what sounds were actually in the intercom system, with a corresponding strong inference that those sounds were actually heard by the crew. But only the human listening can give first hand evidence of what s/he heard and what s/he interpreted what s/he heard to mean.
Is the incompetence, (or unwillingness to gather evidence), sufficient to assume the with-holding of any ungathered evidence ccould constitute a contempt of the Court/ Parliament.
"the whole truth, nothing but the truth, (insert affirmation /or Diety swearing here). The cockpit sounds are NOT insignificant.
So help me God!
You may call it theatre
Yes gaunty, the theatre of the absurd. I'm sure youv'e heard of it?