

Partisans increasingly view each other as immoral. New research reveals the depth of that conviction.

By Phillip McGarry
Ph.D. Candidate in Experimental Psychology
University of Tennessee
Introduction
Both Republicans and Democratsย regarded people with opposing political views as less moralย than people in their own party, even when their political opposites acted fairly or kindly toward them, according to experimentsย myย colleaguesย andย Iย recently conducted. Even participants who self-identified as only moderately conservative or liberal made the same harsh moral judgments about those on the other side of the political divide.
Psychology researcher Eli Finkel and his colleagues have suggested that moral judgmentย plays a major role in political polarizationย in the United States. My research team wondered if acts demonstrating good moral character could counteract partisan animosity. In other words, would you think more highly of someone who treated you well โ regardless of their political leanings?
We decided to conduct an experiment based on game theory and turned toย the Ultimatum Game, which researchers developed to study the role of fairness in cooperation. Psychology researcher Hanah Chapman and her colleagues have demonstrated thatย unfairness in the Ultimatum Game elicits moral disgust, making it a good tool for us to use to study moral judgment in real time.
The Ultimatum Game allowed us to experimentally manipulate whether partisans were treated unfairly, fairly or even kindly by political opponents. Participants had no knowledge about the person they were playing with beyond party affiliation and how they played the game.

In our experiments, even after fair or kind treatment, participants still rated political opponents as less moral. Moreover, this was true even for participants who didnโt consider themselves to have strong political bias.
Other psychology studies suggest thatย conservatives are more politically extreme, being more likely to adopt right-wing authoritarianism and moreย sensitive to moral disgust. However, in our experiments, we found no differences in party animosity and moral judgment between liberals and conservatives, suggesting political polarization is a bipartisan phenomenon.
Why It Matters
Our experiments illustrate the magnitude ofย current political polarization in the United States,ย which has been increasingย for at least the last four decades.
Americans with different political opinionsย could once cooperate and maintain friendshipsย with one another. But as political attitudes begin to coincide with moral convictions, partisans increasingly view each other as immoral.
My colleagues and I are particularly interested in this topic, as we worry about the potential for political polarization based on moral convictions toย descend into political violence.
What’s Next
My colleagues and I believe that a controlled scientific approach, rather than speculation, could help find ways to mitigate political polarization. Currently, we are running experiments to explore how online interaction โ for example, through social media โ can foster psychological distance between partisans. Weโre also investigating how emotions such as disgust can contribute to the moral component of partisan animosity, and how the evolutionary origins of morality may play a psychological role in political polarization.
Originally published by The Conversation, 02.01.2024, under the terms of a Creative Commons Attribution/No derivatives license.


