In the real world, as a Canadian, he has entitlements to protection from the abusive treatment he got while in US custody.  Those protections were deliberately denied and that is why he is eligible for a payment.  See my comment above.  More could have been added but for limitations on size.  Even the US legal community has said Khadr should not have been sent to Gitmo and that their "justice system" in his case was "questionable."