Yes, call me a fool, but in the U.S. we would assume that a "judge" is an impartial participant in the process. Police arrest and charge a defendant, and the prosecutor (part of the executive branch of government) takes him before a judge or magistrate (part of the judicial branch) who decides whether there is sufficient evidence to hold him, sets bail, etc. A judge plays no role in the investigation of a crime before it comes before him as part of a public proceeding, and can throw out the charge and set the defendant free if he wants to. If a "judge" in Italy is part of the prosecution team, that is a very different role. An American college student would not be likely to understand that, or to understand her rights more broadly in a foreign system. There also appears to be a strong incentive to question someone as a "witness" as long as possible and even extract a signed statement from them before formally naming them a "suspect." Questions about the Italian system really are about whether the system is structured to reach the correct result, meaning convict the guilty and free the innocent (and yes, the U.S. system makes plenty of mistakes too).