If there is one country that best represents the possibility of cutting gun crime by increasing gun control, it is Australia.

In 1996, 28-year-old Martin Bryant finished his lunch in a café in the seaside resort of Port Arthur and pulled out a semi-automatic rifle. In the first 15 seconds of his attack, he killed 12 and wounded 10. In all, he shot more than 50 people in six locations, killing 35. The worst mass shooting in Australia's history capped a violent decade of mass shootings that killed nearly 100 – and Australians had had enough.

Only 12 days later, Prime Minister John Howard – a conservative who had just been elected with the help of gun owners – pushed through not only new gun control laws, but also the most ambitious gun buyback program seen in recent memory.