What math? And now that you deleted my comment let me tell you again. On the Allied side of the war no singular nation was more mobilized, spent more money or lost more total lives (other than China) than the US and it wasn't even existentially threatened. It fought becuase it believed right to do so. In the cold war add another almost 300,000 to that number. 

So, uh, I think America has done its fair share for freedom in the world. My point being we do not have to look to Australia, though I love the Aussies, for bravery on the gun matter. The American will to forge its own destiny has been has been the envy of the world, not the other way round.