If you look at the statistics of how many people are actually killed by knives, it is not that high. Sure, if a man who outweighs his wife by 50 pounds sticks a knife in her ten or fifteen times, she usually dies. But when one man attacks another on the street and the two are actively fighting, the one without the knife is often not killed. To kill a person with a knife, you need to sever major arteries which are deep in the body or puncture the lungs or heart, which is protected by the ribcage. To actually ram a knife through the ribcage while that person is fighting you is not that easy. This is not to say that it cannot be done. But given a choice, I would rather take the gun. It is as fast as the knife, it is not any easier to take away, it really scares criminals, and dead criminals cannot sue you. try to come close enough to grab a gun away from a person, and they will shoot you.
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