Doesn't matter if you're mentally unstable or not, there's people who do it on a whim and don't know what they're doing at that point.
When did this happen, probably years ago
sweden is that city in russia right? ?
and franceand norwayand sweden
Besides, if there somehow turns out there is a psycho who legally owns a gun, there would be other sane people who could easily put him down with their guns.
How would you tell the insane person from sane persons if everyone is just banging their guns?
The insane person would probably start shooting. Again, I still think psychological tests are necessary to own a firearm.
France and (youth) riots belong together like Germany and beer. Norway has not had "real" riots since the 70's. We have small muslim/palestina riots every now and then, but nothing serious. http://en.wikipedia.org/wiki/2008%E2%80%932009_Anti-Israel_riots_in_NorwayI don't know about Sweden, but I doubt they have any big riots like those in France and London.
You also use school shootings as an example, and kids cannot own guns. I'm asking you to show proof of how people legally owning guns are more dangerous.
sweden: http://www.bbc.co.uk/news/10276738