The third article of the U.S. Constitution includes a striking phrase forbidding Congress to "work Corruption of Blood." This was intended to forbid the practice under the old tyrannical kings of punishing children and heirs for the acts of their parents. It therefore appeals to a basic moral intuition: the innocent should not suffer for the deeds of another person.
And yet, right now, there is reportedly an Iranian family—a mother, a father, and a teenage son—being held captive in a detention camp on U.S. soil—all because one of them happens to be the child of someone indirectly involved in the 1979 Iranian hostage crisis.