How about a mandatory year in the slammer for a first offence. Think that might provide some attitude adjustment?
At no stage do I advocate or brush off the breaching of isolation orders, I've done two of them myself. I merely point out that human behaviour, especially in our type of democracy will always favour self interest. Always. And sometimes that self interest is necessary for survival, like putting food on the table or paying the rent.
Your friend Daniel Andrews has set the precedent when it comes to not charging people for intentional breaches, something about wanting them to be honest about contact they've had with others.