I love the child-like naivety of your suggestion Porter.
Not really.
Who would you have preside over this investigation? You would never get a public prosecutor because successive governments have already admitted Mahon got it right and has apologised to the victim's families on every anniversary of the accident.
You're not serious are you? I could find 10 investigators within a week that would take it on. I'm not talking about a prosecution dude, I'm talking an investigation.
True, and this is a shame. But you could still re-examine the evidence available and any competent observer would conclude that Air New Zealand, Civil Aviation, ALPA, and Jim Collins all committed errors in the absence of which the disaster would not have occurred.
This is on the right track. And you could add the political interference that possibly (probably) had a bearing on both gentlemen. Plus a stack of other factors.