America's latest mass shooting, this time at a Christian elementary school in Nashville, Tenn., has recalled nightmarish memories and raised one of the most vexing of political questions.
Before the funerals had even begun for the three children and three adults slain on Monday, the well-practiced roaring and debate had resumed in Congress. And so had the usual expressions of exasperation, because those who have followed the issue in recent decades have had an education in frustration and futility.
