Our Founding Fathers insisted upon including the Second Amendment in the Bill of Rights because they recognized the fundamental human right of self-defense, whether against government tyranny or individual criminal aggression. To left-wing activists, that notion is a quaint remnant of a long-bygone era. Such ideologues ignore events as recent as the 1992 Los Angeles riots, when Korean shopowners defended themselves against murder and mayhem amid the absence of police protection. Now, the tiny isolated town of Aguila, Arizona provides the latest evidence that the right to keep and bear arms remains critical. The community of 1,064 has found itself...