Final answer:
Marji's aunt is angry because Dr. Fathi's explanation of the war seems to trivialize the conflict and dismiss the personal suffering it has caused, creating a sense of frustration with his perceived lack of empathy.
Step-by-step explanation:
Marji's aunt is angry at Dr. Fathi's explanation of the war because she perceives it as a trivialization of the conflict and its impacts. Dr. Fathi's statements suggest that the war has somehow been beneficial to the country, which can sound dismissive to those who have experienced tragedy and loss as a result of the war. Marji's aunt likely feels that the doctor's views negate the personal suffering and the senseless aspects of war, and thus, she becomes frustrated with his inability to acknowledge the pain it has brought to individuals and families.