There are some of those survivors of school shootings who feel the school could have prevented such a tragedy if they had better security. Also the authorities ignoring the red flags sent up by the shooter in Fla. was a clear failure on their part. But it is easier to just blame a tool for the tragedy.
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This is sadly not that uncommon in some large cities which are riddled with high crime due to gang wars, usually over drug trafficking. Chicago has some of the strictest gun laws in the country. The root of the problem needs to be addressed, not the tools being used. And most of those ( if not all ) shooters I feel safe to say, are not good guys who legally posses firearms. :P