Cazatou,
You very conveniently forget:
1. The BOI were not "experienced" they were "inexperienced". That is not my opinion but that of Sir William Wratten, given in his interview to Jeremy Paxman.
2. The BOI in spite of failing to take any evidence from Burke, Witness A or any other evidence of Airworthiness did not find the pilots guilty of Gross Negligence.
It was only the "inexperienced" Wratten and Day who did so.