I have found that in almost all organizations, "inexcusable" is circumstantial and extremely relative.
Also it's a function of your perceived value to the organization.
If you're a peon, almost anything except following orders is inexcusable. If it is perceived that you earn the organization tangible results, much less is inexcusable and you get away with more.
I'm just describing a facet of jungle law that seems to be widespread.
Granted, just because someone draws in millions of dollars in endowments doesn't mean they should act like a monster.