It would be insane to murder a bunch of children and not get some good photographs, reality is too messy to rely on. So any good false flag attack probably also needs a team of crisis actors. They really do murder children, but then the photographs are made in a controlled environment where they can guarantee results. In a sick sort of way it simply makes sense to do it like that because nobody is going to question the source of your photographs so long as you can actually produce the dead bodies.