We’ve been saying it for a long, long time (in Internet terms): all Americans have a natural, civil and Constitutional right to keep and bear arms. Some Americans have more of a pressing need to exercise that right than others; entire classes of people are more likely to be subject to violent attack than the average population. Members of the LGBT community, for example. And law-abiding citizens living in crime-infested neighborhoods. They should be armed. The recent “unrest” in Philadelphia and Ferguson has . . .