Aussies aren’t going to go too out of their way to piss the Chinese off. Most of their commodity based economy is dependent on exports to China and Chinese investment... Pluse the ChiComs are using their money to buy politicians in that part of the world.
China is starting their imperial phase and it’s better to kill a few fishing boats to get them to stop and think than it is to wait for their forces to follow the same roads and paths that Japan went down in the 1940’s.