Most of those are suicides so that goes back more so to the mental health rather then guns being the problem.
English
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It says at the top that the number doesn't include suicides.
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It says that suicides go unreported. I am fairly certain those are included though.
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It says the number is just reported killings though. If you go to the link the OP edited in you can also see that they're all killings by clicking through each of the people in the chart.