First of all, I don't like what the Bush administration is doing at Gitmo. They are playing loose with civil rights and that's a bad thing. Also, torture is a very bad thing and is a bad way to interrogate. I don't think that many people have a good feel for how poor a strategy it is. Often, the situation is sold as "if lives are at stake, what is it worth to get the information?" In reality, if interrogators use torture, there is little chance of getting good information. Torture has no place in any sound interrogation.
On the other hand, this kid doesn't strike me as someone who is worthy of much pity. His family has been involved with al-Qaida including financing them.
Khadr, who is a Canadian citizen but was raised in Afghanistan, was questioned about his family, which has a long history of alleged involvement with radical Islamic causes. His Egyptian-born father, Ahmed Said Khadr, and some of his brothers fought for al-Qaida and had stayed with Osama bin Laden.This does not look like a naive US college student toying with extremism. This seems to be a family that has actively supported a very nasty cause. If this kid were let go, perhaps he would foment more nastiness against the US. This might be even more true now that he thinks he has been so poorly treated, but it quite possibly would have been true regardless.
It seems that when someone pleads convincingly, people can fall for it and come to their side. When I see someone pleading convincingly, I think to myself: What would this person do if he were guilty? Nothing different. This kid quite possibly wants to get out of Gitmo so he can head back to Afghanistan. Just because he cries when interrogated doesn't mean he's a good kid, so I'm not willing to exonorate him based on his tears any more than I am willing to convict him without solid evidence.
I have seen nothing that indicates he has been tortured, but the US better keep it that way. If this kid is who he seems to be, the US needs to find a way to de-fang him and keep him from motivating more extremism. Only when this is done in a way that avoids all torture and provides a good chance of a fair justicial process can the US feel good about what was done.