Uh, no theirs have declined.
And I don't care about the "Criminals". Most gun deaths are suicides and domestic arguments.
Australians have always had a low crime rate. And they had fewer guns as well.
As for the Australian suicide rates, they are: "Suicide rates in Australia peaked in 1963 (17.5 per 100,000), declining to 11.3 per 100,000 in 1984, and climbing back to 14.6 in 1997. Rates have been lower than this since that year. The age-standardised suicide rate for persons in 2012 was 11.2 per 100,000"
So they were 11.3 per 100k in 1984, and they were 11.2 per 100k in 2012. The year after the gun restrictions hit was the highest they had been, at 14.6 per 100k. So apparently gun restrictions have little or no positive effect on suicides.
2/3 of the gun deaths from the numbers you want to use are suicides. And since you have no evidence that removing guns will lower the suicide rates, it is a ridiculous argument. The gun restrictions in Australia didn't have any effect on suicide rates. Japan has very strict gun laws and suicides rates far greater than ours.
From:
Putting Gun Death Statistics in Perspective
"According to the FBI, almost four in ten homicides
are classified as "unknown" while arguments are, predictably, the top cause of known homicides. It is unclear what percentage of gun deaths are gang-related nationally and even from one city to the next. So while Detroit logs some 350 homicides annually, there is no hard statistic to grasp the exact percentage that is gang-related or involving gang-members. In New Orleans,
between 35-55% of homicides are classified as gang-related. In Chicago, an
estimated 80% of homicides are gang-related. And in Baltimore, the police
commissioner states that 80% of homicides are drug-related. (But again, most of this depends on methods of keeping records, and, often, personal opinions.)"
So depending on where you live, violent crime from the streets can be a serious issue.