Gun accidents? Guns are dangrous?

[Misfire]

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A law-abiding citizen has no problem getting a gun under any of the proposed regulations to my knowledge (except for outright banning of all guns which is never gonna happen in the US anyway).

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It happened at Virginia Tech. Law abiding citizens could not have guns and the results were predictable.

Please show me one case in American--no, strike that--in world history of a mass shooting where citizens could legally carry concealed firearms. Bonus points for one where the shooter killed himself (meaning no more victims would have been shot) before someone else got to him.