A central debate in the conspiracy theory research concerns how to understand conspiracy theories in a theoretically fruitful way given our research interest to study the nature of such theories and those who believe in them. However, far from settling on one account, this is still an on-going dispute in which researchers take widely different positions. For instance, while some argue for a purely descriptive understanding, others seem strongly committed to the view that conspiracy theories are, or can be shown (...) to be, inherently irrational. In an attempt to reconstruct this controversy, I argue that the disagreement arises because there are in fact two distinct motives underlying scholarly studies in the field: to attain objective knowledge of the phenomena in question versus to defend beliefs and norms that are part of the researcher’s own cultural context. This paper examines the epistemological and methodological challenges in the study of conspiracy theories, focusing on how competing frameworks—normative cultural biases versus objective scientific inquiry—shape our understanding of rational belief. I argue, finally, that if the motive is to attain objective knowledge, there is no serious alternative to the descriptive understanding of conspiracy theories. (shrink)