If you'd killed a paying passenger (despite being prohibited from carrying them) who had discovered your operation because you'd continued to advertise a paying passenger service (despite being prohibited from carrying them) and that unfortunate customer had naively expected that an Australian aviation company advertising joyflights was in fact conforming with the regulations and allowed to do so, then the community in general and the relatives of said passenger in particular should expect that the ATSB would as you say, sift through the wreckage and find out what went wrong so all reasonable steps could be taken to prevent a repeat occurence. They should also wonder why a regulator, if it was aware of breaches, did not take all possible steps to prevent those breaches re-occuring before someone ended up dead rather than after, or indeed even then.
Another quick question without notice;
In the YLHR crash, what airline name was displayed in large text down the sides of the Transair aircraft, and what Company name was written on the tickets?
Transair perhaps?