Dabiene Caristiana
Your friendly neighborhood weirdo
Good and Evil is really an illusion. It's a matter of perspective. It's based on intent. If your intention is 'good' but you perform 'evil' deeds in order to facilitate, how do you weigh the action? It's much easier for me to look at it from a different perspective... service to self or service to others. That is the real polarity of the Universe imo.
Vampires are parasites. They cannot exist without serving themselves to another entity's blood. Be it a rat or a human, it makes no difference. Something else must die or suffer a loss in order for the vampire to exist. By default, all vampires are service to self... therefore 'evil'. Blood Potions may seem like a nice workaround but that blood in the potion came from something.
In my opinion...
Since the subject of "what if the source was evil would it be good then?" debate is being discussed...
What about 'regular' people? We have to kill in order to have sustenance. Does that make us evil? We harvest another living creature for it's meat. How is it any different in that context?
Everything needs energy to survive. Thus, in my mind for a vampire that was created in vile circumstances (Lamae Beolfag tale) if they fed off bandits or people that would do harm to innocent people they are inadvertently saving someone's life. However, vampires can snap...
However we're part of nature so... For me as long as the death is quick and nearly painless then I'm fine with it. And the body's resource is made to good used and not wasted it's fine. Then again I grew up in an area full of avid hunters. So... my opinion may be biased. XD