caz:
Of course it could have done, but that then leaves us with an aircraft flying at 160kts + directly at fog enshrouded high ground which it subsequently hit.
That'll be the helicopter seen beneath cloud flying towards a clearly visible coastline respecting VFR for the type and its speed.
What act of folly,in your book, do you have to commit before it becomes negligence?
Since we have no idea why the aorcraft subsequently climbed into cloud and impacted the Mull, why, pray do you assume it to be a negligent act of folly, beyond any doubt whatsoever?