I resigned from XOM a few months ago of my own accord. (Not NSI or PIP). It was simply the right time to take the pension and frankly I did not like what I saw in terms of leadership behavior and the type of people who were put into positions of power. The toxicity and the politics were so bad that I had to leave before it further corrupts me.
The following excerpt from HBR pretty much sums up the corrosive nature of unchecked egos.
"The inflated ego that comes with success – the bigger salary, the nicer office, the easy laughs – often makes us feel as if we’ve found the eternal answer to being a leader. But the reality is, we haven’t. An inflated ego makes us susceptible to manipulation; it narrows our field of vision; and it corrupts our behavior, often causing us to act against our values. Breaking free of an overly-protective or inflated ego and avoiding the leadership bubble is an important and challenging job that requires selflessness, reflection, and courage."
https://hbr.org/2018/11/ego-is-the-enemy-of-good-leadership