BTW, Iceland has horrible gun laws. No pistols.
Curious. In some years there are no murders in the entire country. The population is only about 300,000, with near 100% literacy.
Violent crime is not really connected to gun laws at all. Good or bad. Firearm freedoms simply help to create equality among young and old, male and female, able bodied and handicaped.
Places with a single homogeneous population, of one culture and one ethnicity, with a decent standard of living often have very low violent crime.
The most ethnically, politically, and culturally diverse places in the world tend to have the most violence.
Standard of living plays into the equation as well.
Both the United States and many parts of the Middle East for example are culturally, ethnically, politically, and religiously diverse.
While a place like Iceland is one people, with one culture, with a very tiny number of people that are not of the same religion, political beliefs, ethnicity, culture and standard of morality.
Quite simply very different people believing very different things, who have different values, cultures, appearances, and genetics (which effects everything from body/brain chemistry to behavioral predispositions) simply don't get along as well together.
Strict censorship (which I don't agree with at the government level) can also play a role in many places, keeping the same standard of morality and acceptance throughout the entire population. Keeping values and morals similar in the entire population, and acceptance and non-acceptance of various behaviors or beliefs mainstream. That can be both legal censorship or voluntary censorship based on things like religious values enforced by the community.
Japan is an often cited example. (and they have horrible gun laws.) Even in such a massive population the homogeneous population is not prone to homicide (but is prone to suicide.) They all think in a very collective way.
Shame is strong in anything done that is outside of what is expected by family or society. The wants and desires of the individual are culturally less important than those of the group.
So the culture does not see many manifestations of selfish homicides.
That is not to say that culture is better overall, in fact the extremely strong and pervasive culture of fantasy and escapism could be attributed to it. People seem to enjoy fantasy to a much larger extent, even more than thier own realities there.