“For those of us who work in marbled halls, guarded constantly by a vigilant and dedicated police force,” Justice Thomas wrote, “the guarantees of the Second Amendment might seem antiquated and superfluous. But the framers made a clear choice: They reserved to all Americans the right to bear arms for self-defense. I do not think we should stand by idly while a state denies its citizens that right, particularly when their very lives may depend on it.”