FirstStep:
I have witnessed the damage the the "other parts" that an uncontained engine failure can cause. Punctures of the wing and fuselage, and possible damage to the engine next door
The early NAL DC-10 accident in which #3 lost all fan blades is an example. One blade was tossed horizontally under the fuselage, disabling the #1 engine gearbox, ergo fuel starvation.
Some other shrapnel went high and was ingested by #2, although it kept running.
Another fan blade penetrated a pax window, and the unbelted passenger has never been found.
