It seems clear that the FSO already has all the answers before the investigations (interviews with all crew on base) have begun in earnest. Previous experience with several operators accounts for nothing and we were encouraged to come up with ideas, as long as we kept it shorter than 10 minutes. And those 10 minutes included his elaboration of why he felt our ideas were rubbish..
So it's up to us crews to get our act together despite management, and deal with the situation that has arisen. For it's our necks on the line.
But yes, mental exhaustion is something to be very aware of, with frequent roster changes, changes of base and changes of A/C type.