Now, hopefully, back to the OP.
Remember, even as head of CDF, Cardinal Ratzinger would not have known the scope of the problem until CDF took the cases themselves, and they got the world-wide scope of the problem. Until that time, cases had been processed piecemeal in Congregation for Clergy, who was notoriously inefficient and cases could stay there for years. Also, for most of the 80s and 90s, it was still believed in clerical heirarchical circles that these guys could be treated, cured, and then restored to ministry - much as they do with priests who are alcoholics. Most cops/lawyers didn’t want to touch these cases with a 10-ft. pole, and would simply refuse to pursue or prosecute, letting the church “handle” the problem internally. Many bishops relied on psychologists and treatment centers to give them the “go-ahead” to put these guys back in circulation. Now, that doesn’t explain why if someone was a repeat offender that some level of common sense didn’t kick in. And it doesn’t explain why this practice continued after psychological science coupled with more societal awareness and media attention made it patently clear that there was no “cure” for this problem and total removal from ministry was the only option.