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Think it might be because of all the 'No Guns Allowed' signs plastered on the doors of businesses all over Nashville? A man's gotta leave his gun somewhere while he's inside, doesn't he?
If they were to dig a little deeper, I'd be willing to bet that vehicle gun thefts go down in the winter when outer clothing allows better concealment of guns, allowing people to carry their weapons undetected in those anti-2A shops.