We're living in a society in the US where every police officer has to assume that everyone they are dealing with is either potentially armed, and if they're reaching for something in their car, they are very likely reaching for a gun. This is not the default assumption perhaps in Western Europe, but in the US, it absolutely has to be. Our failures of gun control are relevant here, but the idea that cops are performing some kind of lynching by shooting someone in the back because he has fought them off, ran around his car, and opened the door and reached—that's just completely untrue given a cop's eye view of the world.