What events and experiences leads Bruno to gradually give up on some of his innocence and see things differently?

In "The Boy in the Striped Pajamas," Bruno's innocence begins to fade as he witnesses the stark realities of his father's role as a commandant and the harsh conditions of the concentration camp. His friendship with Shmuel, a boy on the other side of the fence, exposes him to the harsh truths of war and the suffering of others. The stark contrast between his sheltered life and the grim existence of those in the camp forces Bruno to confront the complexities of human morality and the consequences of prejudice. Ultimately, his tragic fate serves as a poignant reminder of the loss of innocence in the face of brutality and injustice.