Angry Child

one of the reason children act in such angry manner is because

"some inexplicable reason they feel that everything that happens to them is simply unfair."

"A happy child with strong self-esteem and an optimistic outlook is not so quick on the draw; she's more likely to empathize with others and can apply better problem-solving skills to frustrating situations. "

"The anger may stem from family problems (such as divorce, alcoholism, death in the family), social problems (loneliness, teasing from peers), school problems (learning difficulties, underachieving), or internal problems (such as depression). The anger can be a reaction to stress in the overwhelmed family, or can be the way the child learned to act in order to get what she wants."

http://www.enotalone.com/article/4452.html