<Snipped quote by The Odeoron>
Perhaps your world wasn't equipped to stop him. As a tier four, that may not be the case.
I think it is more so that in our world, our God still held out hope, much like yourself, that he would repent eventually hence only locking him up in the deepest pits of hell as its king and ruler... here... well things can go in any direction really, that is what frightens me...