First off, many of the costs the article refers to (such as police time and resources) would not be compensated by insurance even if the shooter was insured. Second, I doubt that properly insured shooters would constitute a large fraction of the shootings that occur. I certainly don't expect gang members to buy gun insurance, do you? So even among the costs eligible for insurance coverage, most of it simply won't get covered.
In other words, it's not enough that the total costs of gun violence is high. The relevant cost is the cost that insurance could actually address, and that's only going to be some small fraction of that total. It's also still an unknown fraction, which means your position is still ultimately one of mere assertion of opinion. And no offense to you personally, but I don't care about your opinion of US gun control.
The newest data I could find suggested that about 40% of offenders obtained their guns from a friend or family member - these would be addressed by liability issues. About 12% were bought from a retail outlet or pawnshop - I guess some would be first time offenders, so there would be no reason to stop them. About 10% stole their guns.
That leaves the about 30% who obtained it from a drug dealer or black market - including a fence.
In the post below I did recognise the problems that the second amendment causes:
I keep seeing this, and it's absolutely disgusting that I, a lawful, responsible, gun owner, should have to pay for what the IRRESPONSIBLE and criminals do.
This just makes no damn sense at all. None.
Just as soon as you start paying for someone else's DUIs and damage to property from DUI drivers, we'll talk.....
Name another right, as enumerated in the Bill of Rights, that requires a person to pay a fee. I think you'll find you need to jump through many hoops, and possibly stretch things, to get an answer.
This is the nub of the issue.
Because of an accident of history, guns in the US have an anomalously privileged situation compared to other OECD countries.
For the UK there is no issue with requiring insurance for something with such a potential for causing harm.
Many guns are more effective weapons than any blade-based weapon - especially in the hands of someone with minimal training. If you are talking about spree killing, the equation is even more in favour of the gun.
In the US, the number of gun deaths is similar to that caused by automobiles, and automobiles do require insurance, as well as being far more important to most people's lifestyles than guns.
However cars are not protected bythe secondany amendment to the US constitution. To me as an outsider, I can see that this causes legal complications, but it doesn't add any logical reasons, as the constitution is simply a document that has been subject to modification.