This is a more general question, which is "Why don't people take accountability for their actions?"
Because it's hard work and it's easier to let someone else bear the costs.
> Why don't people take accountability for their actions?
This is not my experience. People who are in positions of power, e.g. managers, are the kind of people who are incapable of admitting fault. They can't lose face so the shit is rolled downhill. It's narcissism.
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That's a more noble aspect of framing the question, and I guess I could even see why someone may try to not kamikaze themselves out of a financially very juicy system even if it was their own actions causing the trouble. However, they all operate in some form of management mesh, so clearly, one level up or across the line must notice or know who caused the chaos?
Maybe it is the nature of how failure is expressed at that level, to know a team of 30 has been let go and is not available as your extended arm to execute anymore. So, where it manifests as a job loss at a level lower, it is merely a limitation of power for them.