Almost all of that stuff about Australia is skewed or fake. Australians do not have a right in their constitution to own firearms and most do not own guns period. Only certain groups were privy to owning handguns (occupational jobs requiring weapons, sporting groups, hunters, collectors, etc.). Furthermore, not all guns were not banned. It was mainly semi automatic weapons and pump action ones that were banned.
The homicide rate in Australia has decreased after the 1997 'ban', the ban did not make the homicide rate did NOT increase.
In Victoria (4.5 million + population) homicides went up from 7 in 96' to 19 in 97. This is a 171% increase, not 300%, but still this doesn't mean shit. If you look at the overall homicide rate in Australia and just don't cherry pick shit, the homicide rate has went down since the ban.
Armed robberies involving firearms have dropped from around 24% in 1997 (before the ban) to under 12% today.
http://www.snopes.com/crime/statistics/ausguns.asp
Regardless, I believe that all citizens in every country should have the right to own shotguns and/or rifles. As for assault weaponry and handguns, I don't see the point.