Taking the short view again are you II?
Can you not see the correlation between the practice of looking at Accidents as isolated events and not a long list of factors?
Both crews were doing an Instrument Approach....both either were or seemed to be doing a Non-Precision Airport based Approach....both hit the surface despite having autopilots, co-pilots, had passed training and checks, and four people died in each event.
The FAA and NTSB each limited their reviews with the Crew, Aircraft, and ATC....and gave scant mention to anything else.
Is that what you want the CAA and AAIB to do on the Shetlands crash....take the short view as you seem to be a proponent of that by your last post.