I'm not concerned about the children being dead, but why the solider is a child in a box being eaten and the priest/priestess is beating a child. How do these represent the classes? The rod and burning books, I get. The iron hand and the heart-shaped box I get. Why is the lawman/woman beating a child? Are you taking a particular view on each of these? Law keeping individuals down, religion attacking individuals, soldiers just being fed to the dogs?
You missed the metaphor completely. The child IS the person with the class. That is their "self." The priest/priestess isn't beating a child, the priest/priestess is being beaten. Same for the lawman/lawwoman and the soldier. The child represents the "self", so the child being dead means that their "self" has been lost. The circumstances are showing what is responsible and why it is happening.
And the dog eating the child is another metaphor. The self is dead, and its death is strengthening the psychological aspect this dog represents.
And yeah, burning books are a pretty stock metaphor as well, aren't they?