In the result of a large smoking hole in this country there will be a Royal Commission, or two, no doubt. The "independent statutory authority" rubbish goes out the window in this scenario. Particularly with what is on the government record at present regarding the Senate AAI and ASRR by David Forsyth.
Truss may thinks he's protected by CASA, however that's a bit like saying that the DAS is protected by having a Board. If I was the new DAS I'd be removing myself from the Board to add another layer of personal risk exposure protection. The smart Senators, have unanimously, put a very strong expert view on public record which is not only responsible action and what taxpayers and the travelling punter expect, it demonstrates their own concerns and diligence.
Albo, Truss and Mrdak are simply rolling the dice.
Gamble responsibly boys!