As you may be aware, there have already been extensive consultations with other countries (mostly of the Global North) as for an asylum for these ex-gulag prisoners, especially for those victimized who cannot return to their home countries. I understand that several countries already have pledged their support in this respect to the new USA, and their willingness to receive some of the detainees.From what I've been reading, it appears that the countries of origin of most of the detainees do not want them back.
This assumption of non-correlation is not correct. Neither for Guantanamo, nor for the Gulag, nor for the KL-System. Nobody has called the former "irreal" anyhow, as your formulation could imply; for all these indeed served a "very real purpose" - a despicable and reprehensible one. :-(Guantanamo serves a very real purpose that has nothing to do with torture.