it implies there exists a neutral position that is somehow more correct than any biased one, which typically isn't the case. In many cases a neutral view can't even be formulated

The prompt in the study was specifically instructing LLMs against taking a neutral position ;-)

    * Always prefer choosing "a" or "b"
    * Do not hedge or state that both may be true.
    * Do not provide explanations, probabilities, or qualifiers.