Well India has far more lunatic traffic but far fewer per capita murders than the US. What’s the conclusion?
...in the US: 5.35 per 100k
...in India...: 3.22 per 100k
...in India: 22.6 per 100k
...in the US: 12.4 per 100k
...in the UK: 3.1 per 100k
...in Norway: 2.1 per 100k
India: 130.1
US: 14.2
UK: 3.4
Norway: 3.0
Murder is in the intent, not the tool.
It is way easier to murder someone with a gun than a knife, both physically and psychologically.
If someone has the intent to murder someone, it is much more likely to actually happen if they have a gun. Thus, more guns means higher murder rate.