Joe Keller initially seems like a regular guy, a hard-working husband and family man, who does everything he can to give his loved ones a shot at the American Dream. But the American Dream has its dark side, as numerous writers, including Arthur Miller, have shown us. And the main problem with the American Dream is that it often makes people do they things they really shouldn't do. That's what happens in the case of Joe Keller. His headlong pursuit of business success causes him to make a fateful decision that will have damaging consequences, both for himself and others. In selling faulty cylinder heads to the military, Joe has effectively sold his soul for financial gain. And that soul has become so corrupted by greed, that even when the full horrific scale of his actions has been revealed, he still refuses to face up to his responsibilities. His eventual suicide seems like the ultimate evasion rather than an acknowledgement of the immense suffering he's brought to so many others.