Meier Lenk said:
the humanisation would be the whole point behind the endeavor
Why? They aren't human, nor are they supposed to be. At best they're very good mimics of the darker traits of humanity, lusting for power or wealth or fame. At worst, they're rotting corpses driven by their horrific thirst.
They are essentially incapable of seeing past their own desires. Not unwilling, incapable. The Dark Magic that drives them purges or perverts any good traits the mortal may have had upon becoming a vampire. Any code of honor, morals, or ethics the Vampire may have believed in before death can be maintained, but only through sheer force of habit, or because it benefits the Vampire in some way.
What I love about the Warhammer Vampire is that it's much less a tragic figure compared to other fantasy settings. There's no Vampire with a heart of gold, who only feeds on the willing and never ever kills anyone and dances with fairies. The very magic that sustains them is evil, and there is no escaping the nature of it's taint. The most heroic act a vampire can commit is self-destruction.
By the way, Meier, I love Vampire Hunter D.
Essentially, Warhammer Vampires are evil badasses. Let's not subject them to
Badass Decay.