The pro-gun argument is that more guns in the hands of good people would make us all safer. The problem is we make so little effort to know of a person is "good."
When school officials are armed, the gun-rights folks tell us, they'll be able to stop a mass shooting. But as we've seen time after time, even armed and trained people can't do that unless they get very lucky. On the other hand, by arming more people, you increase the chances of the kind of unexpected violence that this story talks about.
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