In the history of the Church, I think we can say that there has been a tendency to use a “need to know” basis for many, many things. Generally, the laity don’t really need to know much of anything about the decision-making of clerics. Generally, clerics in one diocese don’t need to know anything about the decision-making of clerics in another diocese. That sort of perspective. There is some value to this, certainly.
For trials in general and criminal trials in particular, benefits that come to mind are:
–Parties and witnesses are more free to speak the truth since they are assured that their statements are not going to be divulged outside of the “courtroom.”
—The reputation and good name of the accused will not be illegitimately harmed by testimony that may not be true (yet is made known).
–Judges will have more freedom to weigh the evidence without feeling public pressure to give more credence to this or that piece of evidence.
–The division between civil and ecclesiastical courts is, in my view, worth maintaining at least in principle: the two do different things and have different standards. The Church keeping her judicial procedures “secret” from the civil judiciary is proper (again, in principle and in my opinion).
–The faithful will not be “scandalized” by the testimony.
The latter point is one that was probably misunderstood, misapplied, abused, etc.
Dan