Final answer:
The themes present in 'Dear Zachary' and 'In Cold Blood' both explore the complexities of human emotions, morality, and the impact of violence, linking them to broader questions of justice and human connection.
Step-by-step explanation:
The discussion of thematic similarities between 'Dear Zachary' and 'In Cold Blood' reveals a focus on the human condition, morality, and the consequences of violence. Despite the differences in the number of perpetrators between the two works, both narratives delve into the depths of human emotions and their impacts on society. The concept of retributive justice, as seen in anthropological reports of tribal systems, is compared with modern approaches to capital punishment, highlighting various perspectives on morality. Moreover, themes of fatalism and mirror images are explored, such as twins Roderick and Madeline in 'The Fall of the House of Usher', intensifying the themes of doom and despair. 'Dear Zachary' and the cited examples from various literary and non-fiction texts, similarly, examine the intricate intricacies of human connections and the emotional toll of tragic events.