It's illegal to kill them everywhere in Australia, most cities it's also illegal to trap them without a permit, and even the you are not allowed to go and release them into the bush, you have to release it where it was, so literally trap in house, release in backyard. It's stupid.
But like the fruit bats, they both turn up in our cities due to us being disgusting humans and them feeding on our food scraps, then we can't get rid of them because 'they have been here for years', which is a Greeny spin for 'yay we saved another annoying regurgitating, fluffy animal, but don't tell anyone it really has only been here several years'.
Again, over to that eastern island we know as NZ, things are more realistic, hey I have a possum in my attic. trap, kill, dispose, fixed.