Okay, this is what I mean. He didn't harbor abusive priests. He did what the clergy and the schools DID in the 60s and 70s. They listened to the mental health "experts" who felt homosexuality and pedophilia could be "cured" via therapy. Now we know differently but at that time it was the accepted treatment. 150 years ago doctors didn't sterilize surgical instruments and guess what? People got massive infections and died. Oops. Should we call those people monsters? Of course not. They did what they did in good faith, thinking they were actually helping people.
Same here. Show me one shred of evidence that Bishop O'Brien didn't think he was doing the right thing, and that he KNOWINGLY put children into the hands of these predators. I don't think you can because you can't actually get into another person's mind to determine what they were thinking.
In retrospect, should he have handled this situation differently? Certainly, as should hundreds of other clergy members, doctors, educators, and Scout leaders. However, at the time they were doing what they felt was best, which is the best we can hope for.