The Honest Broker versus the Epistocrat: Attenuating Distrust in Science by Disentangling Science from Politics

People's trust in science is generally high. Yet in public policy disputes invoking scientific issues, people's trust in science is typically polarized, aligned with their political preferences. Theorists of science and democracy have reasoned that a polarization of trust in scientific information could be mitigated by clearly disentangling scientific claims from political ones. We tested this proposition experimentally in three German public policy disputes: a) school closures versus openings during the COVID-19 pandemic, b) a ban on versus a continuation of domestic air traffic in view of climate change, and c) the shooting of wolves in residential areas or their protection. In each case study, we exposed participants to one of four versions of a news item citing a scientist reporting their research and giving policy advice. The scientist's quotes differed with regard to the direction and style of their policy advice. As an epistocrat, the scientist blurs the distinction between scientific and political claims, purporting to "prove" a policy and thereby precluding a societal debate over values and policy priorities. As an honest broker, the scientist distinguishes between scientific and political claims, presenting a policy option while acknowledging the limitations of their disciplinary scientific perspective of a broader societal problem. We find that public policy advice in the style of an honest broker versus that of an epistocrat can attenuate political polarization of trust in scientists and scientific findings by enhancing trust primarily among the most politically challenged.