Actually it's a quite healthy way to vent fear, embrace the concept of righteous retribution, and it beats another piano practice.
Stop the touchy, feely crap, these children are in the middle of the caludron of fear, yet, as you should ascertain from the graphic, they do not fear and proudly inscribe the tip of the spear.
These kids are spending a good portion of their days in bomb shelters because madmen are indiscriminately firing missiles at their homes. Let them inscribe the shells that are being fired back at these men, and know that they are being protected and that their country has the power to hit back.