It's my opinion it is always fatigue that causes these major accidents. That's because the whole thing isn't handled well. I've been in many situations where the 'janitors', operators, think they can inspect the life out things. This gives them lots of work, but it is mostly not effective.
Fatigue failure always starts from the inside and works its way out. Casual visual inspection does not work. In this case, they left sections of the cable uninspected, because it was too much work. In nearly every case, it is where the clamp attaches the cable, and forms a 'kink'. That kink moves back and forth, and causes fatigue failure in an 'invisible' manner.
The airline industry handles this by switching out notorious parts that can experience fatigue. No inspections, just melt it down again. So for this case, you would have a 'lifetime' for the cable. Obviously not done. An effective braking system would have saved everybody, so not done either.
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