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"Does anyone know if the 5 released prisoners can sue the government, or otherwise get any compensation for their treatment? God knows they deserve it"
The Urighurs mentioned by omooex are a very good example of why people haven't been released-- there isn't anywhere to release them to, or if there is, it is a state where continued torture and execution is a likely outcome. And you can't release them into the US, because once they are legally on US soil, well it will be lawsuit time. Huge lawsuit time. Massive, crushing, turning over the rocks and watching the insects scuttle away lawsuit time.
Which kinda puts The Stain and his friends in a dilemma; once you start doing something like Gitmo, it becomes very difficult and unpleasant to stop, rather like heroin I suppose.