I also don't like your use of statistics, 'there are 40% more deaths caused by motor vehicles than guns' says nothing, I assure you the population of motor vehicle users is a lot more than 40% higher than the number of people that own or are regularly around guns.
For more on whether games can be used as murder training simulators, check out the books 'Fun Inc.' and 'Grand Theft Childhood' (I forget the authors names, but they should be easy to find) they each have some interesting chapters about shooting real vs virtual guns.
Recently I've been looking into visiting a shooting range, purely because I'm interested to see if I can shoot as accurately without a virtual reticule or crosshair hovering in the air everywhere I look.
The article did offer an interesting insight to the gun-enthusiast community though, Coming from UK, where most cops don't even carry guns, and now living in Australia where cops and security guards do, but no-one else other than farmers and, occasionally, criminals (in fact there's been talk of banning handguns outright after a security guard was killed with his own weapon in a recent shooting). I'm interested to know more about their motivations other than 'it's fun' to shoot guns. what legitimate reason would a civilian have for owning an ACR or even any kind of assault rifle or smg. Rifles and shotguns used for hunting, farming and sports, are one thing, but I don't understand why you'd buy a tactical grade weapon unless you intend to kill someone, or are expecting to be in a firefight in the near future. Personal defense doesn't really cut it for me either. if you're that concerned, keep a baseball bat next to your bed (in UK or Australia) or if you live somewhere where guns are more ubiquitous, keep a handgun in a safe somewhere on hand, but no-one needs an uzi in their kitchen cupboard.
However the gun crime argument is far too complex to be blamed on a single scapegoat like games or rock'n'roll sadly it's a very small and misled minority that generally commit these random killing sprees, and while I don't believe that the actions of these people (such as children or mentally ill) should be cause to inflict restrictions on the rest of us, it seems clear to me that if guns were less accessible, there would be less gun crime.
And I have spent some time in USA, I know a little about the reasons behind the right to bear arms, I was also present at a shooting in Colorado during my stay, so this is a topic that interests me a little