The thing is, Australia has never had a particular strong gun culture. Firearm ownership in Australia has always been dominated by things like .22 rifles and basic shotguns.
That’s got very little to do with laws, or anything, but with a different history.
Americans have been fed a narrative about Australia that suggests there was some huge seismic shift in the attitude towards firearms here in the late 1990s. There really wasn’t. Very few people had ever owned anything particularly heavy duty. It’s just never been part of the culture.
We don’t like in the outback, Crocodile Dundee style - well, very few of us do. That’s the Australian mythology but it’s not the reality.
As we settled the interior - and we didn’t settle all that much of it - the police went with the settlers. A ‘frontier mindset’ like that that developed in the lot of the US didn’t develop in the same way here.