**While even folkloric vampires of the Balkans and Eastern Europe had a wide range of appearance ranging from nearly human to bloated rotting corpses, it was interpretation of the vampire by the http://en.wikipedia.org/wiki/Christian_Church and the success of http://en.wikipedia.org/wiki/Vampire_literature,
http://en.wikipedia.org/wiki/Vampire#cite_note-Development-8http://en.wikipedia.org/wiki/Vampire#cite_note-Lore-9 namely http://en.wikipedia.org/wiki/John_William_Polidori's 1819 novella
http://en.wikipedia.org/wiki/The_Vampyre that established the archetype of charismatic and sophisticated vampire; it is arguably the most influential vampire work of the early 19th century**
quoted from wiki.
going back to the vampire scares of the middle ages on why people thought the dead were coming back to life as vampires is easy. people would dig up the suspected vampire and think they were alive on basic reasons.
bloated corpse (they thought it meant it had fed, actually its just a symptom of decomp.)
blood coming out of the mouth (obviously it had drank blood, actually just another stage of decomp.)
hair and finger nails continue to grow (must be alive then? nope happens when you die. )
but its hard to say one version is right or wrong when vampire are not real.
-classic good looking charasmatic vampires.
-classic evil demon vampires
-combinations of both (recent vanhellsing movie and i think inspiration for Skyrim change system)
its also silly to say that the skyrim vampires are not lore when. . .bethesda makes the lore, what they do in game is the new lore. im sure every book in game is not true, just as every book in life is not true, perhaps beth should start adding genre's to book titles? (fiction, non fiction, etc.)

vampires are buggy in game, and beth could have added fixes but didnt.
in the end its always the same reason:
Time - Law
