The thing is Lanman, if that bloke was acting impulsively he wouldn't have a gun in the 1st place, however if it was premeditated he would have purchased that firearm illegally anyway. However in countries with low rates of firearms, they are much more expensive (because of lack of supply) consequently, even criminals have a low rate of firearm ownership too.
Didn't you bother to read my 1st post -
"Well the only nation that I can think of off hand that gets close to fitting the bill as a nation where only the police/military are armed is Japan, .
Nows as far as nations with high rates of firearm ownership, we have South Africa, the US, Israel, Switzerland, Columbia, Pakistan.
Could we come to any conclusions by comparing those nations, I think not, there are just too many other varibles.
However in nations where there is a low rate of firarm ownership, there's also lower rates of criminals possesing firarms - maybe because they cost more because of limited avaliability. I do know that virtually all the recidivous criminals I know (mainly drug dealers & car theives) would, if they came across a firearm, would sell it before the day is out, as they just arn't worth the hassle here. Plus because supply is limited you can get good money for them, Even a South American S&W.380 'knock off' clone would be worth $500 in Oz on the blackmarket - except for the standard exceptions (working in law enforcement, security, war trophies prior to 1946, family heirlooms, amtique firearms, etc) handguns have been illegal in Australia, since about 1920).
Plus just by the simple fact there are lower rates of firearm ownership there would definitly be lower rates of firearm incidents such as accidents & impulsive/compulsive acts by ordinary people who just 'lose it' because of jealousy, drunkenous, domestics, etc.
But as far as premeditated acts of firarm violence are concerned I doubt there'd be much difference as we all know criminals don't worry about gun laws. However there maybe less crimes of opportunity, where firearms are involved, just because avaliability is less so they are harder to come by & are more expensive"
Anyway its too late for the US as there are simply too many guns out there for any such legislation to work except in the very long term. Plus if they chosed to have an idiotic wastefull buyback scheme like they did in here in Australia it would cost billions/trillions, well something like that.