A symptom of having guns everywhere.
Actually not so much. Globally, the correlation between firearm ownership and availability, and firearm-related violent crime, is actually
far weaker than anti-gun groups claim. It's actually number three, behind race and socioeconomic inequality as expressed by Gini coefficient. Race is its own complex set of issues, not least of which is racial disparity in income and (criminal
and civil) justice outcomes. The latter being noteworthy here as we're discussing cop violence.
Second Amendment advocates particularly like to point out outlier countries with high firearms per capita but low firearm-related crime rate (usually, Canada and the Nordic countries), but the proof in the pudding is countries with
low firearms per capita but
high firearm-related crime rate. Mostly, that's Latin America and sub-Saharan Africa -- but it's not limited to countries wracked by civil conflict and organized crime. South Africa in particular with its combination of strict gun regulation, comparatively (at least to the countries that usually get attention) few firearms per capita, but disproportionately-high firearm homicide rate, tells the tale.
The distinction should be self-evident: those high firearms/low crime countries are in the economic North, and those low firearms/high crime countries are in the economic South. Meaning, high income inequality and poverty, unstable (or failing) government, social unrest, and resultingly, high crime.
Where the US fits into this, is it's an exorbitantly wealthy economic North country that's run like an economic South country. We're
only an outlier if you compare firearms per capita to firearm-related crime rate; if you compare
Gini coefficient to firearm-related crime rate, we're right on par.