I never side with the vampires in any case, however I disagree that vampires are all monsters and guilty. Just because they are vampires, doesn't mean they are uncivil or unreasonable. Dangerous? Absolutely, but who isn't in Skyrim? You can find an old lady in the wilderness who greets you and treats you kindly, but if you dare explore her cabin she will start to kill you for no reason!
But even if they are vampires I still respect them, such as that one vampire who sell logs to you. What's her name again?