Someone already posted the famous video that should be required viewing for anyone disputing the actions of the police. At 20 feet, with a knife I can kill a person with a holstered gun. At 20 feet, with a knife I can kill everyone without a gun.
I don't have a solution for what the police should do, but until there is a better option for the police they will be forced to use lethal force. Gun defeats knife only at a set distance. It unfortunately is not a hard lesson to learn, but deadly if you forget it.
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