Human beings have always formulated strong opinions based upon very little information. To make a successful argument, one requires an active listener. Copernicus, the astronomer most credited with challenging the notion that the the earth was the center of the Universe, made eloquent arguments in the 1500s that the earth actually revolved around the sun. While there were some scholars who believed his arguments despite the lack of a clear religious explanation for his observations, his theory was very slow to gain acceptance because most scholars of his day were not interested in hearing a theory that challenged their deeply held assumptions.
The political process, rather than challenging our belief systems, actually serves to reinforce them. A conservative candidate will speak the shared language of his or her conservative supporters, the “preaching to the choir” principle. It happens with all political philosophies, a product of our inherently tribal nature. At some point, most of us humans stop being active listeners and instead hear only what we want to hear. Change happens not just because of new ideas, but because we were open to listening to those new ideas.