It could be several reasons.   Correlation is not always causation.   My point was that you are also comparing two different countries.    We have gun control in Chicago which is IN this country and it has the most gun related deaths EACH MONTH out of anywhere else in the country.

I also don't really care about statistics in this case as it's pretty easy to get statistics to show what you want to support your agendas by framing it.   I do not believe one side fits all.   I can't find cases where that works either.    It also does not tell us what is going on with black market instances in that country, yet again it is potentially quite different there.   I'd need to research the culture and history of the country.

A gun is a tool.   A car is a tool.     There are going to be countries with higher per capita deaths with cars as well, and it may or may not be due to laws.   It also depends upon how broad you are willing to leave your statistics.    Do you as I said include suicides?   Is that just violent murders?   It is relevant.    How many of them stopped further violence?

With cars do you include people that were driving without a license into the stats.   Why is that relevant?   They are not supposed to be driving without a license anyway so they are already operating outside the law.    This same type of situation also occurs in relation to guns.   Often the people involved in these things are not acquiring guns by legal means.   So they are already outside of the laws.

Banning does not stop people from getting things.    Some recent activities the person made the gun themselves which is not something terribly complicated to learn to do.   Neither recent event Las Vegas or Texas Church Shooting would have been stopped by gun control.   There is also STRONG evidence the Texas Shooting would have been FAR worse if we had gun control as the guy that stopped him and pursued him was not the police, they were late to the scene after that church was shot up and the guy had a truck full of guns and seemed to be potentially heading towards an even larger church.   That guy shouldn't have had any of those anyway he already had things that HAD the military reported it like they are supposed to he would not have been able to get those guns legally.    They failed to report what they needed to report, so the guy went through background checks and all of that but no flags came up due to the military not reporting what they should have.

Yet, that is just one case.    That one is a good illustration of what can happen if you pass laws which will take guns away from people for self defense, and really doesn't do anything to stop criminals already planning to break laws.    It creates a nice victim pool.

EDIT: If you are banning a tool, and there is a correlation such as your stats then since those tools are not self propelled and automated I would suspect CULTURE has a larger factor than the tool itself.    Depending upon the culture removing one tool may just move the stats to similar occurrences with different tools.    Yet, they don't usually go into this level of detail in such agenda driven statistics.   The pro-gun crowd can do this too.

So ultimately you could play the stats game with banning books, banning drugs, and banning whatever you want.

I don't know of a case where IF I AM AWARE OF IT ON A LARGE DEGREE the banning does not lead to power and corruption within the government, and by extension further problems without actually seeming to stop what the ban was intended for.

Having not spent any time in Australia many of the factors I'd know in the U.S. outside of just the reported statistics are not things I'd be immersed in and know about.