The papacy is a monarchy. They don't call it the Holy Roman Empire for nothing. When the monarch exiles you, it doesn't matter if you disagree with the writ of exile, you're kicked out. You know what the tiara on the papal arms means, right? (I guess Benedict the XVI opted not to keep the tiara, but that's a new thing.)
When an innocent man is wrongly convicted he suffers the consequences of being imprisoned, yet he remains innocent and suffers no spiritual penalty in the eyes of God.