Dick Heller is reportedly mulling another lawsuit against the District of Columbia, and once again—it’s over the Second Amendment. Heller was the man who brought about the key DC v. Heller case that tossed the city’s handgun ban and asserted an individual right for Americans to own firearms outside of service in a militia. Yet, it only applied to federal enclaves. In 2010, McDonald v. Chicago expanded that standard to the states. There’s no doubt the capital also faces differing circumstances, given the number of VIPs that reside in the area, like the president of the United States, but that...