The one thing in common among the school shootings that have horrified America and stolen so many precious lives was not the type of weapon, or the type of school or even the type of community. The one thing in common is that no one in the school was shooting back.

The fact is that school shooters prey on gun-free zones where they know that they will be unchallenged. Notice that mass shootings do not occur at gun ranges or hunt clubs or

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