Because he is an enemy combatant. Gitmo is hardly a torture camp. They just got a new soccer field. It should be a torture camp. Not a single inmate should have either finger or toe nails by now.
He was abducted in Thailand. You did read that didnt you ? He is in bad health and has never been accused,tried or convicted of a crime.
You cant seem to make a case that justifies this and I suspect that you are a bit ashamed that these things are being done,ostensibly, in your name. I know that I am ashamed of my governments role in all of this.