Dual citizenship is a great convenience for certain favored people and those who serve them. But it shakes loose the wider society's understanding of itself as a people - and thus shakes loose the basis on which it can secure its own rights. Citizenship rights are not just an abstract but a practical thing. They have to be not just dreamed up and proposed, but also administered and defended. They are most likely to produce a stable and just society when the people who are asserting them are the same people who are defending them.