http://www.cbsnews.com/htdocs/pdf/crimenlatinfull.pdf
Please pay particular attention to paragraph 15, which obligates anyone with knowledge of a priest abusing the confessional for the purpose of solicitation to come forward, under pain of excommunication for failing to do so. This penalty is stipulated, the document says, "lest the offense remain occult and unpunished and always with inestimable detriment to souls."
Get it? That's just more hiding of the crime.