Boslandew
We all (I think) accept that pilot error is indeed a possible cause of this accident. Sadly for the MOD this 'possibility' would fall well short of even 'balance of probability' never mind 'absolutely no doubt whatsoever'.
There are, as you have already accepted, other possible causes of aircraft accidents, few of which can be positively excluded in this case!
Even 'pilot error' does not necessarily have to fall into the category of negligence!!!
I would argue that, in a perverse way, this case is complicated, by the overwhelming absence of reliable factual information!
But then we have to start arguing about what constitutes a 'fact'!
I know what I think the word means. I also think Sheriff Sir Steven Young, and many others, have a pretty good idea too!