Major engine rotating parts are the only components on the whole of the aircraft to be considered non fail safe.
Well they are like aircraft components such as keel beams and wing spars sized and life limited to not fail and if the(engine) do fail the aircraft design need to provide mitigation against the loss of the aircraft from such uncontained consequences
That way a really bad engine day is quite rare compared to a myriad of other causes. The larger risks are where the aircraft is on the ground (debris re-bounds, fuel pool fires, etc.)