negative reviews removed from tripadvisor

how is it possible that tripadvisor removes NEGATIVE reviews???? i've been following a thread now about my brother/sister's trip - and all, and i mean ALL of the reviews 3stars or less disappear. if this is possible, what is the point of the reviews on tripadvisor? this is ridiculous. there are tons and TONS of threads/ forums on tripadvisor talking about this very issue. there needs to be some kind of response to this issue.
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