I guess I still don't really see what your initial comment here is supposed to contribute in response to OP, which isn't really about being for or against child soldiers, or whether some child soldiers are good and others are bad.
OP isn't really even about child soldiers per se. It's about media narratives associated with images of children handling weapons in the contexts of two conflicts, one of the differences between which being that in only one case does the commentary on the image venture as to suggest that the child pictured has been conscripted as a soldier. It's also about, perhaps more crucially, how allegations of child soldierdom are being used to justify killing children generally, across a whole, captive, civilian population, and that, again, in only one of those two contexts.
(My question was searching for an interpretation that connects GGP back to either of those, which are what the OP is about.)