This is something that only happens in cheap police dramas. It doesn't happen in real life.
No, i understand that in your world criminals fess up the moment they come into contact with police. It must be a blessing to live in Utopia.
See below. There had been no investigation, so they had no facts. If there had been an investigation, then there would be details established at this period which would be part of the prosecution case. Felici's statements about knowing what was correct or incorrect, are straightforward lies. Of course, their "facts that we knew to be true" included that Patrick Lumumba was the murderer, and this soon had to be abandoned.
What were the investigators interviewing all those people besides Amanda and Raffaele for, if there was no investigation? Why were they visiting the cottage where Meredith was murdered if not for an investigation? Just passing time?
What can't be denied is that the Felici had decided in advance what statement would come out of the session with Amanda.
Of course it can be denied because till date you haven't presented any evidence to support your allegations.
It won't prevent anyone from believing it; only from saying it. As for your reasons for what you believe: that's something I can only guess at.
It wouldn't prevent me from saying it either.
What evidence do you expect her to have? Are you seriously saying that someone is not entitled to give their side of a story without the threat of a six-year jail sentence?
Certainly someone is entitled to give their side of the story. But be ready to have evidence for the claims made. Or in Amanda's case, at least be able to identify the woman who allegedly hit her on the head. That would have been a start at least.
The police have no independent evidence that they did not hit her, other than their own uncorroborated denials; and we know that this police force, as a corporate body, tells lies. Unlike Amanda, they could be expected to provide the recorded evidence to show what happened or didn't happen, but for whatever reason they either didn't record it or are withholding the recordings.
Uhm... i do believe that the translator who was present during the interview/interrogation was not part of the Perugian police force. There for his/her word can be considered independent confirmation of the events that took place.

Whatever the difference, the significance of it in this context is thoroughly obscure. It seems you are OK with the state of affairs that police can arrange things so that they can behave however they like in this situation, and will use their powers of prosecution to suppress any criticism.
And it seems that you are okay that anyone can just accuse officers of inappropriate behavior, without any evidence to back up the accusations, and expect that them to get away with that without consequences, even if the subsequent investigation has not revealed any wrong doing by the police officers involved.
What do you think they were doing? As far as I can gather, the "investigation" in the first days consisted entirely of harrassing Amanda and Raffaele (over 40 hours of "interviews" with Amanda alone between midday on 2 Nov and daybreak on 6 Nov), gathering salacious details to leak to the press, and manipulating them into incriminating each other.
I think the police officers were doing their job, and investigating a murder. Amanda and Raffaele, as people who had been spending time in the cottage before the body of Meredith was discovered were quite naturally the greatest persons of interest during the early days. Add dissimilar and shifting alibis for the night the murder took place and the pair puts themselves firmly in the spotlight.
Breathtaking. Have you any experience of being arrested and interrogated? Did it happen to you at the age of 20?
Not arrested but interrogated/interviewed when I was 19. Anything else you would like to know?