You ought to try it!
Perhaps this hasn't been made perfectly clear, but let me try again. In the Italian system there are (almost) automatically three trials.
1. The first one, which handed down the dubious 'guilty' verdict which many of us are skeptical of as it requires that biology, physics, forensics, logic and common sense to be different in the state of Umbria. It was also prosecuted by a corrupt kook, which means that even had Amanda and Raffaele been found
not guilty, they'd still have had to endure another trial--this one--because the prosecution has the latitude to appeal even a not guilty verdict. They can also appeal the sentence, which Mignini did, thus they now face life in prison as 25 & 26 year sentences weren't enough for him.
2. Now we are at the second one, the first appeal which is another completely new trial, with witnesses and everything as you've seen! Even if Raffaele and Amanda are found guilty by this court, it will go to the next level
automatically. If they are found not guilty it may
also go to the next level, as the prosecution could appeal that as well.
3. Then it goes to the Supreme Court which in this case, in the unlikely event it gets that far, will almost certainly find Amanda and Raffaele not guilty and release them. Then they will start paying them money for the wreckage this inane system has done to their lives. That's because in a case like this it is virtually impossible for a rational and scientifically literate person to conclude they were involved beyond a reasonable doubt. Especially when science says it's almost impossible they could have even been there, that's what all those people talking about computer records and stomach contents are trying to get across.
If for some bizarre corrupt reason it gets past the Supreme Court, then it will go to the ECHR and they have
lots of experience rectifying the errors of the Italian Court System.
Since this is a severe pain in the ass and takes forever, guilty people (for the most part) often opt for a 'fast track' procedure which abbreviates the first trial, skips the second one and sends it to the Supreme Court. They receive a one third reduction from their final sentence as a reward. That's what Rudy Guede did, which is why he has already been found guilty.
The people that you might have known who thought them guilty, weren't doing so on the basis of rationality, or skepticism. It mainly comes down to political views or the assumption the cops were so incompetent they could have been guilty anyway despite the fact the evidence accepted by the last court is all irrelevant or bogus.