Earlier quoted context omitted.
>Against what? In the US, that would be against the individuals who collectively commit millions of violent crimes per year (surveys indicate this number easily exceeds 5 million per year).
The US is awash with guns. There are multiple guns for every US citizens. Despite all these guns the US, as you say, is also a very violent crime ridden country. Can you see how the guns aren't working?
I can see that they're not an automatic cure-all for violence. There are parts of the US with extremely high gun ownership rates, and virtually no crime. And there are parts of the US with high gun ownership rates and high levels of crime. The fact is that there are many people in this world with violent tendencies. There always have been. Their violent tendencies are not a consequence of guns being around.
However, guns are a very effective tool for defending one's self and one's family against such people.