A rooster can do serious and even permanent harm to a child, even blinding them with beak and spurs. I understand the feelings of love, loyalty and protection you have toward your roo, but a parent's desire to protect his child immeasurably surpasses that. A rooster known to be aggressive gets no sympathy from me where a child is involved. Sounds like you knew there could be trouble. Therefore IMO, the responsibility was on you to keep the rooster contained away from the children so no harm could come to them, then this would not have happened. The owner of an animal is liable for any harm inflicted by said animal, and any parent is within his or her right to protect their child from harm inflicted or in danger of being inflicted by said animal.