JP
You really are an uncharitable sort, aren't you.
The pilots were not found guilty of having 'goofed', which I would suppose you might equate with pilot error.
No one on this forum has suggested that this is impossible.
They were found to have been 'Grossly negligent' which is an enormous leap from error. Such an enormous leap that the RAF's own rules stated that it must be proved beyond any doubt whatsoever.
What is it that you find so difficult with the concept.
Proof positive that something happened is not the same as no proof that something else occurred.