Very sad, it also upsets me to think I would have behaved that way a few years ago. The Watchtower explains God's sense of justice is that children share in the sins of their parents and so deserve destruction.
Reasoning from the Scriptures pp.47-48 "What will happen to young children at Armageddon? The Bible does not directly answer that question, and we are not the judges. However, the Bible does show that God views the young children of true Christians as "holy." (1 Cor. 7:14) It also reveals that in times past when God destroyed the wicked he likewise destroyed their little ones."