I've been arguing by email with RW friend following the MSU tragedy. Every time I show the correlation between increasing gun sales and increasing homicides & mass shooting, he trots out his "correlation doesn't prove causality" line. He argued that strong gun controls don't work. I responded with the Australian example. He responded with a H.W. Bush DOJ publication from 1992 that argued that gun controls don't work. I pointed out that the paper was published 4 years BEFORE the shooting 1/n