But the law is effective at taking guns out of people's hands. The black market is not magically filling the gap. That's my first point.
And also, we haven't seen psychopaths kill multitudes of people in Australia using a bomb or something, contrary to the common refrain that restricting weapons is useless because the crazy guy might just use a bomb.
Bombs are kind of hard to make, while guns are ready-made. You also have to find a way to test the bomb. That's my second point. They had a decrease in mass shootings. James Holmes, Adam Lanza, Jared Loughner, or this guy
http://en.wikipedia.org/wiki/2012_Minneapolis_workplace_shooting
etc would not have happened in Australia because those guys would not be able to obtain a weapon.
I'll have to look more into crime rates in Australia. I wonder what are the laws are on non-lethal defense in the country. I actually came to the conclusion not long ago that practically, a can of pepper spray makes more sense for most people than a gun in defense on the street. Home defense I do think a gun is needed, as well as for small businessmen.