Flying lawyer your post said it all! I would take issue with you on one small point; the term professional pilot is most often used to describe those of us who get paid to fly!
In my experience it more aptly describes a state of mind and I have met many so-called amateur pilots who have been very professional in their approach to aviation. I have also met a number of pilots who fly for a living who do not deserve the title professional I am sad to say.
However, your point is well made and I have commented on other threads that this site can be damaging to the industry at times. A few lazy journalists certainly quote this site as a reliable source of information, which it is not! The term professional and journalist often do not go hand in hand either!
Whatever happened at Duxford was an accident, blame is not the issue. We may never know for sure what happened, it could happen to any aviator at any time it is the nature of aviation there will always be an element of risk.