Of course guns are not a good thing. They are a terrible thing. Much like nuclear weapons.
But can you think of a better deterrant than... another gun?
I can't.
Necessary evil, I guess.

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"Man lives in the sunlit world of that which he believes to be reality. But unseen by most is an underworld, a place that is just as real... but not as brightly lit... A DARK SIDE!"
-opening from Tales From the Darkside