Even so, excommunication is religious tool, and using it for political means in feudal quarrels is strictly speaking corruption. Now, the way this works in CK2 causes at least two problems: 1) when a ruler asks the HoR to excommunicate someone, it has almost never religious reasons and 2) the game states openly what happened: "duke x has been excommunicated at the request of emperor y" i.e. it is known to everyone whos asked for it. This is a very open form of corruption and power abuse. The religion should at least get a hefty hit to moral authority for this.
This happened ages ago, when excommunications were far more common. I was playing 1066 Vanilla start, as Anjou. Firstly, every King of France, starting with Philip, the King at the 1066 Start, got excommunicated. If he was under 16, then the Pope would wait until he hit 16, and give him an excommunication as a birthday prezzie.
If the King did that Act of Contrition that made the Pope undo the excommunication, another duke would walk up to the Pope less than a year later, and get the poor King excommunicated yet again.
On this playthrough, every King of France got excommunicate. Every...single...King...from first to last; and many got it multiple times.
One particularly egregious example that comes to mind was when the current King of France-Zealous, Kind, Charitable, and Diligent-went off on Crusade.
He had all good traits, no bad, and no murders or adultery, on his ticket, *AND* he was on Crusade. Pope Excommunicated him anyway.
I know you guys want to see more excommunications. But, for me, they need to *MAKE SENSE*...
And...if the Pope really *IS* going to excommunicate a good son of the Catholic Church, when all the evidence-Traits/deeds/whatever-say he shouldn't, then there should be serious repercussions for the Pope that did the excommunicating, and the sonofabitch that asked him to do it.
As it is now, there are *NO* downsides to wrongfully asking the Pope to excommunicate someone. None at all...
There should at least be a fifty/fifty chance of negative outcomes, perhaps even higher, if the target doesn't have any obvious vices; like Known Kinslaying, or Known Adultery