here’s the cycle of poverty. There’s the cycle of violence. And then there’s the cycle of gun talk. It starts with a mass shooting. Gun-control advocates blame the deaths on gun-control opponents, who argue, in turn, that none of the proposed restrictions would have had any effect on the incident in question. The debate goes nowhere. The media move on. Until the next incident, when the cycle begins again. So with the Roseburg massacre in Oregon. Within hours, President Obama takes to the microphones to furiously denounce the National Rifle Association and its ilk for resisting “common-sense gun-safety laws.” His...