Moving right along in America's gun control, er, "conversation," we now have the illuminating debate over the alleged criminality of "Meet the Press" host David Gregory. Somehow this seems appropriate to the quality of the rest of the gun debate.The Washington Post reported Wednesday that Washington, D.C. police are investigating the notorious NBC News crime boss for using an unlawful rifle magazine as a prop for his Sunday program. The Post says Mr. Gregory had asked police for permission to acquire the 30-round rifle magazine, which is banned under D.C. law, but police refused. Mr. Gregory displayed the ammo anyway during his interview with Wayne LaPierre of the National Rifle Association.This has created an uproar, with gun rights advocates calling for Mr. Gregory's indictment, if not yet the death penalty, and police acknowledging their probe.How perfect can you get? Mr. Gregory interrogates Mr. LaPierre on the subject of whether to ban a magazine that it is illegal for Mr. Gregory to display but apparently easy enough to acquire in time for a Sunday morning broadcast. So here we have a possible indictment that would be entirely nonsensical of a journalist who was trying to embarrass an NRA official over an ammunition ban whose impact would be entirely symbolic.Various media are also reporting that an online petition is underway on the White House website calling for Mr. Gregory's indictment. It isn't clear that Mr. Gregory is guilty of anything other than perhaps overzealousness in pursuit of the conventional gun-control wisdom, which is not a crime unless we want to empty newsrooms and fill up jails from coast to coast.