Very very interesting cases as none of these locos would be able to buy guns in their countries of birth.

You are fighting a losing battle here, mate.  You have been a longtime contributor to this site, and I usually find myself agreeing with you, but rather than explain why I disagree with your points I'll try to explain why you stand a snowballs chance in hell of winning this argument.

 First of all, you feel that you're arguing from what you consider a logical point of view, i.e. that if there fewer guns available in general society there would be less gun violence.  I will concede that if all of the guns in the world ceased to exist overnight there would be no gun deaths tomorrow (at least until they started making them again), but since we know that won't happen the only other way to remove guns from society is to take them away from people who own them, including those of us that currently own them in compliance with the laws in place (which is most of us).  This is where your argument hits a brick wall, because those of us that favor guns rights are being asked to concede that the right to own firearms and protect yourself with those firearms is a right that they should surrender to the government.  Would you give up your freedom of speech just because the government decided they didn't think that you were responsible enough to exercise it?  This may seem like an apple and oranges comparison to you, but it isn't at all to us.  A lot of people in the U.S. consider the right to keep and bear arms just as valuable as the right to free speech and the excercise of religion.  I'm sorry it has gotten a little personal, but when you tell someone that they should give up what they consider a fundamental right they tend to become angry and defensive. 

You cited a lot of statistics supporting your point of view, but as you saw, we pro-gunners have a lot of statics as well.  Mark Twain once said that "there are lies, damn lies, and statistics."  The gun rights argument has been going on for well over forty years, and both sides have been lobbing crime statistics back and forth from the beginning. 

My advice to you is to simply let this one go.  There is an old saying in America:  "Don't wrestle in the mud with a pig.  You'll only get dirty and the pig likes it." 

They may win an argument here , but the consesus is against guns.

Stop trying to make friends with me, its embarressing.