Cannot wait to see your mistakes.
Anyway to your article the statistics prove nothing other than a small town has fluctuating crime rates because just a few less or a few more crimes make huge differences to the statistics. As they say there are lies, damn lies and statistics. Take a small quiet town, where no doubt, everybody knows everybody and tend to look after their neighbours, give them all guns you will not turn them into murderers.
Take a huge metropolis with a multicultural and diverse population which has crime, gangs, drugs and racial problems. Make them all carry guns then wait for world war 3.