This article gets it mostly right. It was the Douglas culture that damaged Boeing's corporate ethics. Boeing has had a continuous streak of ethical breaches ever since the Douglas "merger" occurred.

https://sites.tufts.edu/corruptarmsdeals/the-boeing-tanker-c...

https://www.nytimes.com/2005/03/08/business/boeing-chief-is-...

https://www.theguardian.com/science/2020/jun/21/nasa-doug-lo...

https://www.reuters.com/article/idUSKBN2603EZ/

https://www.justice.gov/opa/pr/boeing-charged-737-max-fraud-...

https://blog.apaonline.org/2019/04/08/the-ethical-failures-b...