Money, money, money. It's all over All My Sons. Protection of assets leads the characters to commit some unsavory acts – but that's the way the world is, right? The doctor's wife nags him to make more house calls to up their income. Joe Keller defends his war profiteering because caring for his family, to him, meant growing his business. Joe's idealistic son, Chris, disdains business, but get some grape juice in him and he's all "Annie, I'm going to make a fortune for you!" to his fiancée (1.545). In this play, capitalist culture is pitted against human decency, and the two just can't seem to get along.
In the world of All My Sons, the moral man is a martyr.
In All My Sons, Miller pits capitalism against morality, implying that they cannot coexist.