Facts and logic please.
There was something seriously wrong with this aircraft, or it's pilot. We do not yet know what.
This was not a Chieftain, it was a Mojave, and it was pressurised, and capable of maintaining about 15,000 ft with one engine inoperative. It had apparently flown only about 5,000 hours. Many of our airliners have flown about ten times that, or more. Many Chieftains have also flown much more than that. And also RFDS PC12's. The The NT Airmed Kingairs for the new top end contract are also "old".
I am saddened to see that some posts on here appear to to criticise the integrity of the operation, (dung heap etc) and by association, the people involved.
We must wait for more information before making any such statements.