The Second Amendment is why we can’t go to school, or work, or a house of worship, or a nightclub, or a movie theater, or a music festival, or pretty much any public gathering without fear of getting shot to death. The Second Amendment is why you can’t be immediately arrested for openly carrying around an assault rifle in a public place, and why you can’t be immediately arrested for smuggling a hand-cannon in your gym shorts. The Second Amendment is how law enforcement justifies the need for military-grade armaments—to match the “firepower” they meet in the streets. The Second...