I'm not a Foreign Affairs minister, with that being said, we could have done more than we did, especially considering Optional Protocol that both America and Canada had signed 6 months prior to his capture. Maybe we couldn't have secured his release but lets keep in mind the USA "pawned" him over to us eventually and the Canadian Govt dragged their feet as long as possible before sticking him in Millhaven.
Rehabilitation programs, certified doctors and support groups potentially with other ex-child soldiers with whom he could connect with on a certain level.
But he wasn't the only "POS" alive as you so elegantly stated in point 2.
Any person with a brain can realize the numerous inconsistencies. Have you ever considered the possibility of friendly fire? The US Govt would never cover up an instance of friendly fire though... would they? *cough pat tillman*
If you bothered to read the links I posted you'd save me a lot of time from having to go back to them, reread and then copy and paste here for you but anyways,
Nobody is claiming that Al Qaeda is as militarily savvy as the US is, they have way less technology, funding and are just rudimentary in the way they do things. I don't buy for a second here that when the IED's are planted by AQ that they are aiming to hit native Afghans (unless they were associated with the US soldiers) - its just the cost of war.. No different than the US targeting insurgents but killing woman and children in drone strikes, they both have "good" intentions so to speak.
If he was over 18 at the time I doubt you would see as much grief for his case. I just don't think that we should have wrote him off early into his stay at GBay as children/teens who commit crimes can be rehabilitated under the right cirumstances, unfortunately for all of us sitting with radical muslims in a military prison probably wasn't the "right circumstances".