Forget Wal-Mart and skip your local gun show. The murderers of tomorrow will not be found wearing orange vests at your local sporting goods store. They won’t have NRA memberships or trophies on their walls. You won’t find them in America. Look for them in Obamerica. 67% of firearm murders took place in the country’s 50 largest metro areas. The 62 cities in those metro areas have a firearm murder rate of 9.7, more than twice the national average. Among teenagers the firearm murder rate is 14.6 or almost three times the national average. Those are the crowded cities of...