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The reason for this is the thugs know nobody will fight back in a city of disarmed wimps. When there were few antigun laws in the '50s the amount of criminality was one tenth of what it is today.
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"about 105 homicides in just Columbus this year, many of them involving firearms."
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And many not involving firearms. Banning firearms would only mean the thugs would find a second weapon ot technique of convenience while leaving victims completely unprotected.