Your political reputation affects how likely allies are to trust you and what kind of deals they'll offer at the negotiating table. There's also some emotional response in there so factions do bear grudges. Just like the real thing.

We cannot embrace God's forgiveness if we are so busy clinging to past wounds and nursing old grudges.

It's a family that's loaded with grudges and passion. We come from a long line of robbers and highwaymen in Italy you know. Killers even.