How many interviews do you have to give before you forfeit the right to a private life then?
I don't know about Portugal, but US libel law is different for 'public figures'. Interestingly, the Supreme Court judges referred to the McCanns as public figures;
In United States law, public figure is a term applied in the context of defamation actions (libel and slander) as well as invasion of privacy. A public figure (such as a politician, celebrity, or business leader) cannot base a lawsuit on incorrect harmful statements unless there is proof that the writer or publisher acted with actual malice (knowledge of falsity or reckless disregard for the truth).[1] The burden of proof in defamation actions is higher in the case of a public figure......A person can become an "involuntary public figure" as the result of publicity, even though that person did not want or invite the public attention.
https://en.wikipedia.org/wiki/Public_figure