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In order to look at this question, we have to look at how Keller saw himself in addition to his actions. Keller didn't see himself as a villain, and yet he was totally complicit is ordering Deever to ship the cylinder heads and neglectful in warning the Army that there were risks in using the defective parts. He was well aware that defects he knew existed in the parts might be missed..... that the parts might in fact be installed, but he didn't want to lose business. Thus, it was more important to do business as usual than protect the lives of others. Keller also allows Steve Deever to take the blame and go to jail, while he goes on with business as usual.
All My Sons