How is Bruno immature in the boy in striped pajamas book?

In "The Boy in the Striped Pajamas," Bruno displays immaturity through his naive perspective and lack of understanding of the world around him. He often acts without considering the consequences of his actions, such as when he explores the fence surrounding the concentration camp without understanding its significance. His simplistic view of friendship and the events happening around him showcases his inability to grasp the complexities of human relationships and the harsh realities of war. This immaturity ultimately highlights the tragic innocence of childhood amidst such profound horrors.