In the novel, The Boy in the Striped Pajamas by John Boyne, how is Bruno innocent and naive?

In the novel, The Boy in the Striped Pajamas by John Boyne, how is Bruno innocent and naive?
In the novel, The Boy in the Striped Pajamas by John Boyne, how is Bruno innocent and naive?

In the novel, The Boy in the Striped Pajamas by John Boyne, how is Bruno innocent and naive?