You have no more idea what Khadr's options were than you have about the case in general.  

YOU might have left the battlefield with the women and children or like Harper you might have run into a closet once  bullets started firing.

If you paid the slightest attention you would know the difference between Taliban and al Qaeda and that Kadhr has in fact apologized and is in fact owed the rights of citizenship.  

Too bad Harper couldn't take legal advice and write a decent law around citizenship rights and responsibilities.