Some quotes from an article in Scientific American by Shawn Lawrence Otto, Antiscience Beliefs Jeopardize U.S. Democracy.
For the first time since the beginning of the Enlightenment era in the mid-17th century, the very idea of science as a way to establish a common book of knowledge about the world is being broadly called into question by heavily financed public relations campaigns.
By falsely equating knowledge with opinion, postmodernists and anti-science conservatives alike collapse our thinking back to a pre-Enlightenment era, leaving no common basis for public policy. Public discourse is reduced to endless warring opinions, none seen as more valid than another. Policy is determined by the loudest voices, reducing us to a world in which might makes right—the classic definition of authoritarianism.
If the press corps does not strive to report objective reality, for which scientific evidence is our only reliable guide, the ship of democracy is set adrift from its moorings in the well-informed voter and becomes vulnerable once again to the tyranny that Jefferson feared.
When facts become opinions, the collective policymaking process of democracy begins to break down. Gone is the common denominator—knowledge—that can bring opposing sides together. Government becomes reactive, expensive and late at solving problems, and the national dialogue becomes mired in warring opinions.