GICASI
Good post, if I may say so.
Far too many people allowed to set a self serving agenda for the investigation (such as it was) and judge their own case. Not just those you speak of, but those in MoD(PE) who were responsible for attaining airworthiness and those in the Support Authority who were meant to maintain it. But these are precisely the people who answer all official questions (or, more to the point, don't answer them or lie in doing so).