On the one hand, we need to be sensitive about what and how we share information with children. At the same time, however, we must involve them as they have a unique power and a closeness to Hashem that can help us in the fight against terror.
Before Purim 5739, the Rebbe held a rally for children. In the sichos, the Rebbe spoke about the greatness of gathering children together, drawing a parallel to the times of Purim when Mordechai gathered children. Towards the end of the rally, the Rebbe spoke about how children today can help eliminate terrorists. In conclusion, the Rebbe asked the children to sing the niggun of Utzu Eitzah so that all the plans of the terrorists, their comrades, and their supporters would be thwarted as if they had never existed.