The sane reaction to the Sandy Hook shooting might have been to look at the country’s mental illness infrastructure. The shooter in the case was clearly sick, and mental illness is the common denominator among these mass shootings, after all, from Newtown to Tucson to Aurora to Virginia Tech and beyond. Instead, look at what we’re doing. The White House and many in Congress have targeted legal gun owners and guns; at least one lawmaker in Iowa has openly called for confiscation of guns from law-abiding citizens; and several media outlets have even run maps showing the homes, addresses and...