The injection of personalities is the only thing that explains Chieffi's reasoning on re-analyzing all of the evidence and rejecting the Hellmann court's lawful verdict.
Saying re-test the remaining knife DNA is one thing, saying Quintavalle shouldn't be rejected because he knew Amanda had blue eyes is idiocy and vindictiveness seeping into the court.
But you are ultimately right that justice should be cold and blind, and even the Italians were finally able to look at Chieffi and Nencini and realize the travesty of injustice that was occurring, and correct it.
You appear to view a court case as some kind of Hollywood script with the good guys in one corner and the baddies in another. Heroes versus villains, like some tacky Greek mythology.
Truth is, law courts are extremely boring places and the machinery of justice slow moving and tedious.
The Chieffi court would have done no more and no less than any other Supreme Court chambers. Their job is consistent and they are all trained to go through the same steps. What they do is:
1. Read through the appeals lodged. They have a very heavy work load and that is all they have time for at this stage.
2. They will then read through the Motivational Reports of the first instance and second instance courts.
3. They will then read the charge sheets.
4. At the hearing, the barristers for each party to the appeal and cross-appeal will submit a skeleton argument (of which the judges will expect brief copies in advance) of what point of law is being appealed.
5. The judges will ask questions.
6. They will then retire to consider the outcome.
7. In Italy, they are obliged to come to a finding ASAP after the hearing.
8. They give their findings, which should be publically available, perhaps as a notice on the court board, or scanned direct to the parties' solicitors.
9. They are required to produce a written reasons report within 90 days.
I promise you, the issue of personalities, nationalities, like, dislike, personal opinion, etc., really do not come into it.