They don't care, Glen, at least not enough to take back responsibility they abdicated to CASA a long time ago.
They don't have to care. There is no political point in governments doing anything about the circumstances you raise. It wouldn't make any difference to either 'side's' electoral chances.
While ever the majority of the public vote either for the Coalition or Labor, both of them win. They just take turns siphoning off national treasure to their mates.
If you've followed the activities of the Senate Rural Regional Affairs and Transport Committee's inquiries and questions at Estimates hearings, you will have observed that there are numerous government Senators - of both persuasions under different governments - who understand exactly what you're talking about, and who would agree almost entirely, if not entirely, with what you're saying. But they do nothing about it, other than huff and puff. That's because they're part of the stultifying mediocrities that have presumed to call themselves governments over the last couple of decades. Hollowmen and Utopia are documentaries, not fiction.
You would be far better off allocating your finite time and treasure to lobbying cross-bench Senators and getting more of them elected. Many if not all of them have the quaint idea that their first priority is to represent and promote the interests of their constituents and the nation, not to obtain and maintain power for power's sake.
Sooner or later a government will need something that requires the support of the cross-bench Senators. If at that point the cross-bench Senators make their support contingent upon something substantive being done about e.g. the sick, expensive, appalling hoax that the regulatory reform program is, the government of the day will pretend to care enough to do something about it. Until then, so far as governments are concerned, CASA's doing a great job. I can quote you Hansard comments to that effect, in the face of the Aviation Accident Inquiry report and the Forsyth report.