The Nuclear Family
The reverse side of Miller's relatedness argument is his downplaying of the family as the nucleus of society. Somehow people are to feel a more general caring for others that is not drawn off by family obligations. What, then, is the place of the family in the larger social system? Discussions of the family serve mostly to contrast characters' opinions about an individual's responsibilities to the family versus society at large. The family is also presented as a unit that can be corrupted and damaged by the actions and denials of its individuals, a small-scale example of the way individual actions can corrupt society.
The Past
All My Sons is a play about the past. It is inescapable--but how exactly does it affect the present and shape the future? Can crimes ever be ignored or forgotten? Most of the dialogue involves various characters discovering various secrets about the recent history of the Keller family. Miller shows how these past secrets have affected those who have kept them. The revelation of the secrets is presented as unavoidable--they were going to come out at some point, no matter what, and it is through Miller's manipulation of the catalysts that the truths are all revealed on the same day. Whilte the revelations are unavoidable, so are their fatal consequences.
Denial and Self-Deception
How do we deceive ourselves and others? We select things to focus on in life, but do we also need to deny certain things in order to live well? What toll does denial take on the psyche, the family, and society? Two main facts about the Keller family history must be confronted. One is Larry's death, and the other is Keller's responsibility for the shipment of defective parts. Mother denies the first while accepting the second, and Keller accepts the first while denying the second. The result is that both characters live in a state of self-deception, willfully ignoring one of the truths so that the family can continue to function in acceptable ways.
Idealism
Chris is described by other characters as an idealist, although we do not see this trait in action aside from his angry response to the wartime profiteering. Yet the others define him by his idealism, setting him apart as a man of scruples. Chris decides that he must abandon these scruples to the cause of practicality when he is faced with the prospect of sending his father to jail. Is idealism sustainable in a fallen, complex world? If ideals must be sacrificed, is there any supervening ideal or principle to help us decide which ideals should be sacrificed in which circumstances?
Business
Keller argues that his actions during the war were defensible ass requirements of good business practice. He also frequently defines himself as an uneducated man, taking pride in his commercial success without traditional book learning. Yet, his sound business sense actually leads to his downfall. This failure is connected with Miller's leftist politics and the play's overall criticisms (shared by some conservatives) of a capitalist system that encourages individuals to value their business sense over their moral sense. How could rules that govern business be exempt from the moral norms and laws governing the rest of society?
Blame
Each character in the play has a different experience of blame. Joe Keller tries to blame anyone and everyone for crimes during the war, first by letting his partner go to jail. Later, when he is confronted with the truth, he blames business practice and the U.S. Army and everyone he can think of--except himself. When he finally does accept blame, after learning how Larry had taken the blame and shame on himself, Keller kills himself. Chris, meanwhile, feels guilty for surviving the war and for having money, but when the crimes are revealed, he places the blame squarely on his father's shoulders. He even blames his father for his own inability to send his father to prison. These are just a few examples of the many instances of deflected blame in this story, and this very human impulse is used to great effect by Miller to demonstrate the true relationships and power plays between characters as they try to maintain self-respect as well as personal and family honor.
The American Dream
Miller points out the flaw with a merely economic interpretation of the American Dream as business success alone. Keller sacrifices other parts of the American Dream for simple economic success. Has he given up part of his basic human decency (consider the pilots) and a successful family life--does he sacrifice Steve or Larry? Miller suggests the flaws of a capitalist who has no grounding in cultural or social morals. While Keller accepted the idea that a good businessman like himself should patch over the flawed shipment, Miller critiques a system that would encourage profit and greed at the expense of human life and happiness. The challenge is to recover the full American Dream of healthy communities with thriving families, whether or not capitalism is the economic system that leads to this happy life. Economic mobility alone can be detrimental--consider George's abandonment of his hometown for big city success. There is a rift in the Bayliss marriage over Dr. Bayliss's desire to do unprofitable research, because his wife wants him to make more money instead of do what he enjoys and what will help others.