http://en.wikipedia.org/wiki/Martin_Bryant
"in the 18 years before the law, Australia suffered 13 mass shootings - but not one in the 14 years after the law took full effect."
The laws were introduced as a direct result of the massacre you're referring to.
It's almost like the less powerful the weapon, the fewer amount of people you can kill.
You should try living in a society without guns, you'll quickly realize how useless these things are.
I live in Australia. Lived in the country and the city. Home invasions are not an issue here.
http://en.wikipedia.org/wiki/List_of_countries_by_intentiona...
http://en.wikipedia.org/wiki/Martin_Bryant