Correlation != Causation regardless. Just about any time you see a statistical correlation used in an argument (especially in the news), there's no proof of causal link. It could as easily be that lower crime rates paradoxically cause an increase in the sales of guns by some social/psychological effect nobody's thought of. Or it could be that the average temperature rose 0.03 degrees during that timeframe, and rising temperatures cause both a drop in crime and an independent increase in gun sales. Or it could be random chance.
There are many more sound arguments for gun ownership than dubious crime stats correlations.
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