No, he took the rights of all combatants under the Geneva Conventions to Afghanistan. 
We're not paying for what he did in Afghanistan, we're paying for what WE did for the next ten years he was in Gitmo. 
Two wrongs don't make a right, and your baseless and ignorant speculation about what he did in Afghanistan is totally irrelevant to Canada's legal obligations. Even Paul Bernardo got a fair trial, Khadr never did.