Indeed. It might be evidence that there are simply way too many guns in the wild in the US; and that statistically, the likelihood of violent conflict is therefore higher in the US than in other countries.

Overall violent crime is not much higher in the US versus other developed nations. Various prominent cities in Europe have serious violent crime problems for example, such as London and Amsterdam. The Netherlands has a higher rate of crime than the US does, and their violence is a lot less lethal. The US rate of lethal violence is higher than its peers and the very easy access to guns is the problem:

https://www.vox.com/2015/8/27/9217163/america-guns-europe

Guns won't go away in the US during our lifetime though no matter what laws are passed or how people feel. It's too deeply embedded.

> the likelihood of violent conflict using a firearm is therefore higher

Violent conflict exists everywhere.

It's not proof but it is evidence

not that it's really an argument for or against but if you try to tell cops that they can't carry guns, they'll all just carry their own personal guns.