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According to the Wikipedia list, there were nine school shootings in the entire decade from 1910-1919. By contrast, there have been 21 so far just this year.
Our population has quadrupled since then, so even if we quadruple the older figure as well, that's still going from 3.6 per year, to 21 per year, and this year isn't even over yet.
I'd say we can cut him a little slack on the 'unheard of' comment.
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