* Military Discipline: Hanley is a strict disciplinarian, upholding the harsh realities of military life. He believes in maintaining order and obedience, even at the cost of compassion. He sees Charlie's gentle nature and pacifism as weaknesses that could endanger the entire unit.
* Fear and Frustration: Hanley is a veteran who has seen the horrors of war firsthand. He fears for the safety of his men, and his frustration with the constant threat of death makes him short-tempered and harsh. He might be projecting his own anxieties onto Charlie, seeing his peaceful nature as naive and reckless.
* Class Difference: Hanley represents the upper class, while Charlie is from a lower social class. This difference in background might contribute to a lack of understanding and empathy. Hanley may view Charlie as someone who doesn't understand the realities of war or the importance of discipline.
* Personal Grievances: Although not explicitly stated, it's possible Hanley harbors personal grudges or resentments towards Charlie, perhaps stemming from an earlier incident or a perceived disrespect. This could explain his seemingly unjustified harshness.
* War's Dehumanizing Effects: The constant threat of death and the brutal realities of war can erode empathy and compassion. Hanley's actions might be a reflection of the dehumanizing effects of war on his own psyche.
Ultimately, Sergeant Hanley's treatment of Charlie is a tragic example of how war can distort human relationships and lead to cruelty and injustice. While Hanley's actions are motivated by a combination of factors, they highlight the devastating impact of war on individuals and their capacity for empathy and compassion.