At the risk of being intimidated by the feds again for posting here,
Okay, that's a bit interesting. What happened? If you're not and have never been a public servant then you can't be prosecuted for speaking against the government, unless it's terrorism related or defamatory (which is a State issue).
The Qantas discussion on PPRuNe has been commercial rather than national interest based, so what have the Feds got to do with a company the government is quite happy to wash its hands of in the interest of fiduciary duties? There is nothing government about Qantas apart from the Qantas Sale Act, which they seem happy to ignore as long as the semantics are satisfied.
Either the survival of Qantas is in the national interest or it isn't. That's for the government of the day (Lord help us

) to decide. If it is, then presumably they will step in as they see fit, which they haven't, being more than happy to whimper in a corner acquiescing to the fat CEOs as usual (Vote Labor! the working men's party

). One can assume that given the lack of action from the government, Qantas is not part of the national interest. If it isn't, then we're discussing company politics and the Feds have nothing to do with it unless you're advocating terrorism, kiddie porn or free movie downloads. If they think otherwise; Get a Lawyer, Son, and start feeling really stressed out.