Earlier quoted context omitted.
How would that imply lack of security? Wouldn't it be perfect if every single homicide by a stranger was by a cop? It would mean that a cop was there every time to stop the criminal before they hurt someone.
That's assuming that the only people cops shoot are criminals. in point of fact, legally, almost everyone the cops shoot are innocent people in the eyes of the law.
For example, we recently had an armed robbery outside a bar here. Police came looking for the perpetrator. They found a man who they suspected might be the robber. He ran from them. They chased him. He turned around with a gun in his hand. They shot and killed him.
Now: Was he innocent in the eyes of the law? He wasn't convicted of that robbery. He wasn't even arrested for it. They would have arrested him (or at least detained him), but he fled, and then turned around with a gun.
So I'm not sure that "innocent in the eyes of the law" says very much. Other than escaped prisoners, everyone the police encounter is innocent in the eyes of the law, at least on the issue for which the police are confronting them.