No, actually, as has  been pointed out several times by posters, the case of Maher Arar is materially different in my view. There was never any suggestion of criminality on the part of Arar. The same cannot be said of  Khadr. My comment regading separating right from wrong was intended to illustrate that being 15 does not exclude you from making that distinction.  The view that, ipso facto, because you are 15, you are exonerated from any moral agency, doesn't hold in my opinion.