On the heels of a New York conviction that stripped Donald Trump of his Second Amendment rights, a federal jury in Delaware is considering whether Hunter Biden violated three gun laws when he bought a revolver in 2018. If Biden is convicted of those felonies, he also will lose the constitutional right to armed self-defense. These two cases—one involving the president’s son, the other involving his opponent in this year’s election—highlight the arbitrariness of a federal law that deprives Americans of their gun rights for reasons that have nothing to do with public safety. That constitutionally…