As pointed out by Jim Jefferies there were 10 mass shooting in the decade prior to Port Arthur when strict gun controls were brought in, since then there have been none so at least in Australia's case the controls did make "these kinds of events" magically disappear.
"Sigh" Spree killings are only a very small part of the picture. I have only done a brief search but it would suggest that less than one half of one percent of all US Murders are committed as a result of spree killings
Even if stricter gun control did stop spree killings it would be extraordinary to declare job done while tens (Hundreds!) of thousands of people each year would still continue to suffer the consequences of violent crime.
And yet I am sure that the Gun control activists would still declare victory while ignoring the devastation caused by violent crime generally. What would you ban next, the Knives that the criminals would turn to? Or even newspapers (You can make a devastatingly lethal weapon out of a newspaper, not least because the victim never sees it coming!)
Yet you started your post of with...
"the correlation between gun ownership and violent crime/murder in the USA is actually very poor"
So I guess the correlation is only poor when it doesn't suit your argument and strong when it does?
Now you are being silly!
You know Damn well that I meant a "Positive correlation" (IE More Guns=More violent crime)
But surely even if there are 'other factors' which contribute the US's overall high level of violent crime, isn't it sensible to restrict a tool solely designed to kill and maim people. In fact if you have a country that has a violent nature doesn't it make gun control MORE necessary.
A tempting argument, but nevertheless the wrong one! Canada has similar levels of gun ownership to the US but with low levels of Gun related crime.
It is violent crime that is the problem, not guns. Violent criminals will still be violent criminals and as I said earlier, Gun restrictions might translate some deaths into serious injuries but that doen't mean you have solved the problem.
The US needs to solve its fundamental problems (Somehow*). If it manages to do this the Gun issue will no longer be an issue.
* (And that is the problem. Nobody wants to even investigate the real issues. It is much easier to cry "Gun control")