>>5718639I have a theory that it might legitimately be the Bretonnian culture at play here. In regards to the peasants, unlike their counterparts anywhere else, they are intentionally kept stupid, dumb, and superstitious. Where as in Araby, Cathay and the Empire the common man actually has a chance at education, advancement, and thus the alures of Chaos the simple minded peasantry of Bretonnia combined with a land relatively well isolated from Chaos and protected by the Lady's blessing and Knights simply have no ambition that is the fuel of chaotic thought. They don't seek new pleasures and sensations, simply pray harder when afflicted by disease, are absolutely too stupid of be of any value to Tzeentch, and are too weak to be of any use to Khorne.
"Blessed is the mind too small for doubt"
Conversely, the Nobility are shielded by the Lady, for the most part. A dedication to chivalry and virtue wards of slaanesh, honour and glory keeps away Khorne, the Lady's blessing wards of Nurgle, and a general hatred of magic keeps Tzeentch at bay.
This is not as effective against Vampires, because the Vampires themselves are also noble and can comprehend noble sensibilities. Furthermore, against the peasantry, they do not care for their souls, merely their bodies, and is perfectly content to just take the easy route of zombifying them.