alt Hacker NewsAustralian policy on guns (princially unifying existing gun regulation across all of Australia including Queensland, Tasmania, and the Territories) had a significant impact on mass shooting, individual shooting, gun suicides, etc throughout the 30 years following the Port Arthur massacre.
During the period legitimate gun ownership (people with guns) has sharply declined in larger urban areas, remained about the same in "working with guns" population demographics, and total numbers of guns in Australia have increased.
No large scale mass shootings since, no "mass shootings" (four or more dead / injured (?? - I can't recall the low bar threshold)) at all for nearly 30 years, three or four such events total overall rather than the practically one a day numbers in the USofA.
No policy or constitution is perfect, of course, Australia is currently in a period of revising some of that policy.
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18 casualties at Croydon park (2025), 57 at Bondi Beech (2025), and a rough survey[] looks like the period proximal before Port Arthur doesn't look much different than after.
The largest one before Port Arthur was Milperra, armed motorcycle gangs, which Australia is speedrunning into resurrecting through their boneheaded cigarette taxes that haved turned half of cigarette vendors into nodes of the black market.
Much fewer than USA, but the Port Arthur changes don't seem to have had much effect.
[] https://en.wikipedia.org/wiki/List_of_mass_shootings_in_Aust...
Australia doesn't have the Second Amendment.
In the US, any gun legislation that could possibly be effective at eliminating gun violence would also by definition be unconstitutional, since there is no way to prevent gun violence to any significant degree without infringing on the right of the people to keep and bear arms.
And a Constitutional amendment to repeal or change the 2A is existentially impossible as it would require the cooperation of Southern states and would threaten the billion dollar gun lobby.