Despite what these nuns may think, the gun issue in the United States is no laughing matter. School shootings have now been with us for a generation; two decades. Or so some news media would have us think, preferring to use the Columbine (Littleton) event as a game changer. In fact, a look at the School Shootings List on Wikipedia shows that incidents so classified go back to the 1800s. A close look at the list shows that Columbine had…