AOG - he is still only a child - a deep disturbed and morally corrupted child, but a child nonetheless.
As I have opined many times before, Islam is less a faith, more a way of life, and for extemeists this is even more the case. their evil and twisted ideology must be discussed with their children morning noon and night.
Children are impressionable and eager to please - a literally lethal combination in this case.
So yes, of course the images are abhorent, as they are intended to be, but that should not detract from the fact that IS manipulate their children in the same way they manipulate western media - with the same aim and result.