Both Republicans and Democrats regarded people with opposing political views as less moral than people in their own party, even when their political opposites acted fairly or kindly toward them, according to experiments my colleagues and I 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 judgment plays a major role in political polarization in the United States. My research te…