Will, unless somebody has proof the pilots were playing canasta on the flight desk as the plane flew into the storm there is no way the pilots can be blamed for the AF447 mess without leading to a conclusion that their training had astounding gaps.
One does not convict on "slightly more likely". One convicts on "beyond reasonable doubt" in polite societies.
Too little evidence exists for a conviction of anybody.
Plenty of evidence exists that various elements of pilot training, the instrumentation, and the flight data computers could be improved.
With all that evidence of "not quite good enough and MIGHT cause problems" there is cause to work for improvement. There is not sufficient evidence to prove the disaster was not caused by a mouse that got on board and chewed through some critical control cables. So apportioning blame and crying for revenge is stupid. It also, if you cannot tell, offends my sense of justice.
JD-EE