Line pilots only hear stories of others foul-ups. A story that may be passed at altitude or at the bar. And then you go on with your day.
The CPO is the one that deals with it day in and day out. Constantly listening to the whiners; the 90/10 rule that I think someone already mentioned.
One can only take so much before it changes the business side. I have two chiefs I’ll talk to and one I’ll avoid. The one I avoid is company first over and above all.