We don't live in a perfect world and occasionally it results in error and misfortune.

When there is only a fraction of a moment available to assess whether someone with a gun in their hand is a threat...it's not hard to understand why, sometimes, tragedies may ensue.

Good training, tactics and cool heads go a long way to reducing the risk. Unfortunately, it can't be eliminated.

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642-1, M&P15 TS