I saw it on tv and it is naive. It is not much different when I was school child during the Cold War under communists, and we were had to manifest for world without nuclear weapons and military, while outside my school we had Soviet base and tanks. Robespierre did use child propaganda as well. In 1794 prior his execution, at the height of his power, and the peak of the Terror, he paraded with 8-9 years of girls in the nice dresses through the streets of Paris and denounced the enemies of the state and warmongers, while guillotine beheaded 50-70 people daily.
The West, USA, Russia, and China needs to realize that they are in war with aggressive Islamic ideology which wants to destroy them. Destroying ISIS in necessary step to break this ideology. Children Crusades in 1200s or small child used in propaganda peace talk after such tragedy as Paris will not stop this ideology. Thousands more people will die and lets hope they will not get hold on WMD.