Let us suppose you are driving across the United States on a trip. You come to a city of 700,000 people — a city the size of Denver. But this city is surrounded by barbed wire. A group of courteous law-enforcement people are in charge, and when you stop and speak to them, they explain that everyone’s life there is about to become much harder.
You ask why. An official tells you: “These people are to be punished. They will never be allowed to work again legally. They’ll have to subsist on whatever income they can get from off-the-books jobs.