Ung, the protagonist of the memoir "First They Killed My Father" by Loung Ung, feels guilty for several reasons. Firstly, she feels guilty for surviving the Khmer Rouge regime in Cambodia while many of her family members and friends did not. Ung witnessed the brutal killings of her siblings, parents, and other relatives, and she often wonders why she was spared when others were not. This survivor's guilt is a common feeling among those who have experienced traumatic events and is a manifestation of post-traumatic stress disorder (PTSD).
Secondly, Ung feels guilty for betraying her family's trust by stealing food from them during their time in the labor camps. She recognizes that her actions were selfish and that they put her family members at risk of starvation. This guilt is a reflection of Ung's strong sense of familial duty and responsibility.
Lastly, Ung feels guilty for not being able to protect her younger sister, Chou, from being taken away by the Khmer Rouge soldiers. Chou was only five years old at the time, and Ung blames herself for not being able to keep her safe. This guilt is a testament to Ung's deep love for her sister and her desire to protect those she cares about.
Overall, Ung's feelings of guilt reveal much about her circumstances and personality. Her experiences during the Khmer Rouge regime were traumatic and have left lasting emotional scars. Her survivor's guilt, sense of duty towards her family, and love for her sister are all indicative of a strong moral compass and a deep capacity for empathy.