I think this kind of symbolic killing is quite clear, a metaphor of life-and-death struggle for status and resources in American society.
Implicit fascist thought: poor, people at the bottom, inferior people, unworthy to live, such a society will become better.
However, even if the middle class is doing well, it seems to be fully insured, but there is still an implicit crisis: the inner conscience.
Because of conscience, letting the escaped black man in, triggered the crisis that followed. And this superficial behavior, out of the son's conscience, has brought about a real purification...heart redemption. Father wakes up and decides to protect black people and resist foreign enemies. He was respected and loved by his family. In the same way, the family, who was finally rescued by black people, also realized the fallacy of killing.
Ivy people, noble, children of wealthy families symbolize some kind of aristocracy. However, the superficial success of these people, the social resources and status they obtained, were obtained by "killing" the lower classes of people.
In the same way, the successful sale of the insurance system comes from extracting the resources of the neighbors. Naturally, the dissatisfaction of the neighbors comes early, and they want to devour them in turn. This is indeed a pathological condition of a capitalist society.
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