I find the attacks on the IDA solely on the basis of the name it has chosen for itself somewhat ironic. The campaign to reform UK Military Air Regulation and Accident Investigation (and no, that isn't a title, merely a description) has shown that many UK Institutions that abound in mandates and authority have serially reneged on both, be they Police Services, Provost Marshals, HSE, MAA, MOD, MPs, etc. They all agree that rocking the boat is against their shared mutual benefit. If the IDA is out to rock that boat then more power to its elbow say I. Better to have no mandate, other than what it invests in itself, than to betray those to whom one has a duty of care.
Titles and awards have become a feature of all that is wrong today, rather than an indication of excellence and professionalism. If the IDA stands for anything it is as a reaction to the failure of leadership of those who indeed do have such mandate and authority. It is they who should face just criticism, not those who seek to make amends for that lack of leadership.