Saeviomagy
Adventurer
As for that WOTC article, suddenly because there is a Vampire PC the world shifts and my 5th level character with Arcana and Religion as trained skills doesn't know anything about vampires? Yeah, right.
No, your 5th level character with arcana and religion knows that despite being compelled to drink blood, there are vampires out there that resist their bestial nature and are heroes, and therefore deciding "hey, let's kill this guy because he's a vampire" is completely not a heroic path to take.