Okay, so then what is? Most jobs have this failure mode because there's a tendency to strip funding until disaster happens, even when it was clearly foreseeable.

Well, there was the time Ronald Reagan fired all the ATC workers [Edit: I had the reason wrong but I still blame Reagan.]

Inadequate funding seems like the common factor across the vast majority of jobs with these failure modes.

Because we need to trust people and it is not sustainable to overstaff.

In my job we work 40h a week + oncall rotating. It works.