this is from the article will quoted above:
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In the US, there are roughly 17,000 murders a year, of which about 15,000 are committed with firearms. By contrast, Britain, Australia and Canada combined see fewer than 350 gun-related murders each year.
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and
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Among Germany's 82 million citizens there have been 794 murders in 2005.
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there's obviously an effect to strict gun controls.
how one would move from correlation to cause is problematic, but it always is with aggregated data.