Finland has guns, but little gun crime. I suspect Finland has neither a melting pot of people that the US has and that it has a much better public health system for the poor and disadvantaged than the US does.
As a Finn, I must note (as was also mentioned in the article you linked, but this being
Still, in terms of guns/capita, Finland ranks rather high. Also in homicides/capita. The homicides are mostly people drunk someplace indoors, an argument arises, someone takes a knife from the kitchen. Or along those lines, the streets are rather safe. But we as a nation are prone to both alcoholism and (perhaps due to said alcoholism) violent behaviour. I dread to think what the situation would be if hand guns were more readily available. So personally, I don't think guns should be banned altogether, but heavily regulated.