Smokey, I think the lesson is that child molesters are drawn to situations where they can have time alone with children. They found a haven in the Boy Scouts until the Scouts instituted a "two-deep" leadership policy. It's not that the Boy Scouts were bad - it's that molesters found a place to operate there. And it took a long time and a lot of incidents and some attempt at denial before the Boy Scouts found a workable solution.
It's not that the Catholic Church wants child molestation to happen - that would make no sense whatsoever. It's true that the Catholic Church did not have adequate safeguards in place. Much of that has changed, but the possibility of child molestation still exists wherever there are children in the company of adults.
There are no sure-fire ways to prevent crime. All we can do is take reasonable precautions.

-Joe-