"The Fr. Tony Walsh story was a terrible thing, but it ended when he was prosecuted 15 years ago."

I wonder if his victims would agree with that statement? I's say they are still living with the consequences.

The points that must be made are:
(1) There can be no statute of limitations on crimes like his.
(2) Those who covered up his crimes(whatever their actual intentions) helped to enable him to carry on abusing others. They should be prosecuted as the law allows, (accomplice/ accessory/ perverting the course of justice etc.
(3) It must be made clear that society will never again allow any institution to operate as a law unto themselves.