Why did the death of James Castle bother Holden?

James Castle's death deeply affected Holden Caulfield because it represented the harsh realities of cruelty and betrayal that Holden often grApples with. Castle, a bullied student, took his own life after enduring relentless torment, which resonated with Holden's own feelings of alienation and his desire to protect the innocent. This event highlighted the themes of isolation and the struggle against the phoniness of the adult world, further intensifying Holden's sense of despair and hopelessness. Ultimately, Castle's death served as a stark reminder of the consequences of bullying and the fragility of youth.