I actually doubt that very much, do you seriously think that if you deliberately caused the death of 149 people in UK, and the evidence is plain on the CVR that you did it and you are still flying happily with the airline that the AAIB would not pass that evidence to the police? Of course they would pass all the evidence to the police or they would be criminally liable themselves. There is a huge difference between an accident due to human error and a deliberate crash
The point that you seem to be having extreme difficulty in grasping, is that what is "deliberate" cannot be determined until a proper investigation has concluded. Therefore if you want the best flight safety system, the quid pro quo is that you must assume those involved are innocent until proven guilty.
Otherwise you compromise the whole reporting system.