How do u explain Bruno's character in chapter 13

Bruno arrives to meet Shmuel a bit later that day. Having learned about Pavel's life from Maria, Bruno asks Shmuel if he knows the old man, but Shmuel tells him he doesn't. Bruno tells Shmuel he wants to be a soldier when he grows up, a "good soldier" like Father, but Shmuel tells him there aren't any good soldiers (140). Shmuel tries to reveal more to Bruno, whispering, "You don't know what it's like here" (ibid.), but Bruno purposefully ignores the statement because it makes him feel awkward. When he brings up Lieutenant Kotler, Shmuel says he doesn't like talking about him. Bruno is beginning to understand the darkness of Shmuel's situation but is avoiding the truth. He clings to idealistic childhood ideas of war and avoids what he knows in his heart about Shmuel's situation.