The following is anecdotal only, but I suggest it shows what might be wrong with police culture in the USA: I saw a clip of an angry man with a big knife being accosted by the police. Fair enough - the police indeed need to deal with this situation as such a man presents a clear and present danger. The cops ordered the guy to drop the knife. He did not and started to move towards them brandishing the knife. Key point: he was at least 10 or 15 yards away! The police shot and killed him. I would have thought the right thing to was to simply back off from the guy and continue to try to talk him out of his angry state.
In short, it certainly appeared that the police did not need to fire their guns. I think, repeat think, there is something wrong with the "culture" of law enforcement in the US.
A man with a knife can close ten yards in less than two seconds, and even if the officer fires in time, the first round (or two or three) may not stop him. One huge fallacy a lot of people live in about real-life self defense is an underestimation of the speed that an assailant can cover ground to make his attack.
What this means is that a woman in a parking lot needs to start taking action against a suspicious man while he's still 15 or more yards away, whether that action is running or screaming...or pulling out her gun. The primary tactic of an assailant against a woman is always to present a friendly face until he can get close enough....
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