Good post.
But in response to the part I underline, I would say damage could be quantified by the amount Amaral made from selling his book and video, and from giving interviews.
Yes I do take your point on that Ferryman. I agree it would be an indication, but we don't know how many of the people who read his book and watched his interviews actually believed him and how many people didn't. IMO far more people did believe him than didn't - but how can you prove it?
Maybe I'm being too pessimistic, but for reasons previously stated - I'm simply not confident enough in the PT judicial system to be sure that the McCanns will get justice and win their case.
Whatever the outcome - I hope they will draw a line under it rather than be dragged into years of appeals etc.
The case has been re-opened by the Portuguese police and they are not suspects - and to me - that is far more important than Amaral's book - which IMO has been thoroughly negated by those facts.