So Jetstar did not press charges? And so there it ends? Must it be this way?
I dealt with a drunken fight on board a flight over India. After landing, weak company representation wanted to do nothing, go away problem please, no publicity thankyou.
I personally insisted prosecution of the offender to local authorities. I checked on him a month later, he was robbed of his savings and rotting in a rat infested cell, without vaseline, awaiting a trial he was doomed to lose. He may still be there today
This approach is probably untested in OZ, but surely an Australian Commander has by the authority of his license power to press charges independently from the employer? Bring it on.