Sacred Haven of Debauchery

But the nobility in other countries is more stable. Their ruler cannot suddenly become possessed and do all sorts of terrible things.

But the rulers of Thedas don't become possessed, at least not on a massive scale. Doesn't this suggest that mages can monitor the behavior of their peers themselves?

You should understand that those in power are rarely liked.

And it also subdues mages who have undergone torture, which is forbidden in all other Circles.