Had Amaral been a private citizen and not an ex policeman he could have written exactly the same book based on the released files and the McCanns would have been awarded nothing.
Possibly, but I'm not too sure about that. The legal arguments used may simply have been different. Freedom of expression still carries responsibilities whoever you are. And publications intended to inform the public have a duty to make a reasonable effort to ensure that their "facts" correspond to the truth and to amend factual information as it emerges.
Under the penal code, defences to "difamação" (an offence to one's honour or consideration) are the pursuit of a legitimate interest (defined somewhere or other) and the ability to prove the truthfulness or to have a justified belief, born in good faith, in the truthfulness of the facts in question.
Would consciously cherry-picking from the files be considered to be "in good faith"? Can the selected facts be proven, or justifiably believed to be true? Does casting aspersions based solely on cherry-picked facts, when other available information invalidates them a demonstration of "good faith"?
There is clearly a grey area, I'd agree, but I'm not sure that the mere fact of being a private citizen offers "carte blanche" immunity from potential prosecution.
For instance, one could cite until the cows come home that it is a "fact" that Eddie reacted to the boot, and substantiate it by the fact that TdeA said so in his interim report. TdeA did state that - that is a fact. But the truth is that Eddie didn't react to the boot - TdeA got it wrong, and that the evidence that Eddie didn't is readily accessible.
Is repeating the so-called find of a 100% match to Madeleine's DNA in the boot, by citing Brunt et al., (who did indeed state that at one point) justifiable in terms of good faith when the subsequent readily accessible forensic reports state otherwise?