Abusers exist, and will find ways to be with vulnerable people.
What sticks in my craw about this situation, is that people in positions of responsibility (Heads of institutions, Heads of Orders, Bishops, Monseignieurs, Canons, & Parish Priests) KNEW what these people were doing.
And rather than take ANY action to stop them, they moved them from place to place when they were discovered, allowing them to offend again & again.
They should have called the cops & used their influence to get a prosecution.
Failing that, they could have used their own organisations to ensure that these abusers were kept away from kids, and given psychological treatment (if they felt it might work).

Those people need to examine their conciences, & stand up in public & admit what they did.