How many other countries are so heavily armed as we are? Maybe we have bad policing and that's why our traffic stops end with relatively higher fatalities. Or maybe our police encounter a much higher relative armed motorists that result in "justified" fatalities? Maybe mixture?
Some of that just may be a "cost of doing business" in terms of being a heavily armed society. Similar to mass shootings are a cost of our gun freedoms.
This is absolutely a contributor to the problem IMHO. We don't live in Mayberry anymore. We've got nearly 400 million guns in this country and a lot of people done lost their minds. It's a dangerous cocktail to try and mix for the police I'm sure.