There are such beings as vampires some of us have evidence that they exist. Even had we not the proof of our own unhappy experience the teachings and the records of the past give proof enough for sane peoples.
They're trying to tell us that we're not right so we have to buy their products. The number one cause of mental illness is not knowing who you are and you can't know who you are if you don't spend time honoring yourself and living in the present.