Well. Vampires were born of [censored] of an innocent woman. And we know nothing about the Dawnguard

Well, look at Janus Hassildor or Sybille Stentor. Both are vampires, both feed on people. Yet you can't really count them in the "evil" group, can you?
But of course, a vampire would look at it differently.
True. Of course, the vampires have their own point of view. The vampire lord obviously sees the sun as evil(check sig). And I recall Farkas talking bad about the werewolf hunters too.
"Silver Hand?"
"
Bad people who don't like werewolves."-Farkas.