Because it showed that he was introduced as a child to the violent situations to which slaves were subjected.
Explanation:
At the beginning of his autobiography, Frederick Douglass relates the traumatic experience he had as a child, involving his aunt and his "master". He describes that his aunt, after disobeying the orders of the owner of the property, was tied up and beaten inhumanly until the owner of the property was tired.
Douglass claims he visualized the blood dripping from his aunt's back, while she screamed and agonized at constant lashes. He had never witnessed a situation like this and it scared him deeply.
