ATF,
At a minimum here, the Vatican is reaping the breach in trust they've created worldwide, by its poor handling of the abuse mess, and their stubborn refusal to establish an effective system of accountability for the bishops.  By choosing NOT to waive immunity here, they have guaranteed that the klieg lights will be on this case.  If they've seen the evidence, and believe it well founded, it would behoove them to make a pretty good show of locking this guy up.  

Sadly, the breach of trust runs really deep now, and I'm not at all sure this will be enough to mend the rift.  This is a great example of where the failure of Francis to follow through with his promised tribunal, and to let two victims walk away from an already sidelined Papa Commission hurts.

This is about justice, but it's also about gospel values.  Do the bishops really believe what they preach?  Thus far, if the jury is still out, it seems to be leaning heavily against them.