I agree with you K in regards to CAR 206, it indeed has been done to death. If anything the Willowbank Inquest findings once again highlight the absurdity of CAR 206 and its application in the real world.
However the point should not be lost that in both Hempel and Willowbank the regulator was negligent in its duty to uphold the principles of the Civil Aviation Act and indeed their own mission/values statement:
Our mission
To enhance and promote aviation safety through effective regulation and by encouraging the wider aviation community to embrace and deliver higher standards of safety.
Our values
These are the principles that guide CASA’s internal conduct as well as its relationship with the wider aviation community:
If Hempel and Willowbank accidents are examples of how they uphold their mission and values or indeed their 'duty of care' to the unsuspecting punter going for an adventure flight or a tandem jump...then 'God help us!'