Double Bogey
You said:
Nobody has ever really explained in the Mull case why the two crew descended to 1000 feet over the sea and flew straight at the mull. If they had observed the simple concept of safety altitude that accident would never have happened
Nobody apart from the President of the Board of Inquiry that is. The icing clearance was +4, safety altitude for the entire route would have been about 6500 feet (at a guess). As our American cousins say, do the math.