Science proves people without guns don't shoot people. Why is this so hard for some people to grasp?

A study of over 130 countries proves if you take away people's guns they stop shooting each other so much
epirev.oxfordjournals.org/.../140.full.pdf+html
No country has ever thought hey our citizens are really violent and crimes rampant. Let's give then guns and it'll make everything OK.
Science proves people without guns don't shoot people. Why is this so hard for some people to grasp?
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