In our civilized society, Khadr, aged 15, would NOT have been allowed to buy tobacco/smoke, buy alcohol/drink, drive/vote etc. ... 

Just think on our reaction if, at his young age of 15, an adult had tried to have consensual sex with him... ?

Our law would have deemed him not capable of making such decisions for himself... 
Yet  look at the what we let happen to a child... Selective morality?? He deserves the cash... Surely... !