If it were merely the executives that made the fatal decisions regarding the 737 MAX then clearing out the top level of management may suffice, but it's fairly

If it were merely the executives that made the fatal decisions regarding the 737 MAX then clearing out the top level of management may suffice, but it's fairly clear that it wasn't a C-level decision in this case. Once you have a bad culture established in an organization it's very hard to turn that around absent a rather drastic purging of employees at multiple levels combined with a very pro-active new management that not only talks about the necessary new culture but also actively implements the incentives required to enforce such a culture. Personally I've had to deal with cultural turn around efforts at companies in the past (albeit nowhere near the scale of Boeing) and over time I learned that the only reliable way to address such a situation is to purge with fire and bring in new people.