

Do you remember how prisoners were kept in Guantanamo Bay, even after they were no longer suspected of any wrongdoing, simply because there wasn’t a country that would both accept them and treat them in accordance with US law? Many of those prisoners ended up nowhere near where they came from.
Some countries refuse to accept deportees. Some countries are so likely to mistreat deportees that sending them to those countries is illegal. Some countries simply don’t exist anymore.
The Uyghurs in Guantanamo didn’t want to go back to China.