You describe the Book of Grudges, and cite several examples - not from the Dammaz Kron, which describes only the most terrible of wrongs done to the Dwarven race, but from the local Books of Grudges maintained in each of the hold, which records every unsettled score. One in particular seems particularly relevant: an unsettled debt between Zhufbar and the Asoborn tribe, where tribesman made a delivery of a cartload of wild grains in exchange for three good axes, only for it to be later discovered that the grains were mouldy and cut with sawdust. After the destruction of Castle Drakenhof, several Grudges against the Vampires were struck out as settled, but so too were several accumulated Grudges against the rulers and population of Stirland - and then, when it was judged that the Grudges struck out were almost but not quite sufficient, they kept going back until they found a Grudge of just the right severity, and only then were the sins of the long-dead Asoborns forgiven.
Judging by the horrified stares you get, the message has been successfully communicated. What you didn't tell them was that the sins of those Asoborns would likely never be pursued, or at least not until the more important Grudges against greenskins, Skaven, Chaos Gods, Chaos Dwarves, Ogres and Elves were settled first. A little terror would be good for them.
