Switzerland is a prime example of guns gone right. About 1 in 3 of the population have a gun in their home, many times an automatic rifle. Yet gun crime is so low they don't even keep records for it. Now, there are a bunch of other factors contributing to that, but I think this at least indicates that heavy prevalence of guns or a 'gun culture' does not make for any kind of violent crime. Clearly, other factors are to blame, for if gun ownership = violent crimes, then Switzerland
must be explained, and it's not. In science, when a theory or model fails to explain
all observable phenomena accurately, it is improved, altered, or altogether thrown out in favor of a model that
does explain the phenomena. With Switzerland and several other countries as examples, we can see that arguing that violent crime is caused in some significant part by gun saturation is a scientifically incomplete, or possibly altogether incorrect, model.
Oops, I realized that that wasn't perfectly on topic.
Why is bearing arms a right? It's a check on the government. It's the right to self-preservation and protection. Kind of the proactive side of the right to life. As has been well pointed out, only after disarming their nations has any systematic domestic genocide occurred in the twentieth century. If you can't defend yourself from your government, you cede the ability to keep or dispense any and all rights to that government. Knowing how well governments seem to manage everything else they have their hands in, why would you trust them with your basic human rights unless you had
some kind of deterrent against abuse? Regardless of how your government parades itself, you must assume it is a wily dictator in the making, and guard your rights, and those of others, fiercely. For all dictators at one time or another had the consent of the governed to take the power they later abused to horrific effect.