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.
Sometimes when we weep in the movies we weep for ourselves or for a life unlived. Or we even go to the movies because we want to resist the emotion that's there in front of us. I think there is always a catharsis that I look for and that makes the movie experience worthwhile.
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If you sit in a position where decisions that you take would have a serious effect on people you can't ignore a lot of experience around the world which says this drug has these negative effects.