Shared reality doesn't break down when people disagree. It breaks down when people are unable to understand the other side's perceptions/interpretations enough

Shared reality doesn't break down when people disagree. It breaks down when people are unable to understand the other side's perceptions/interpretations enough to understand the disagreement. As a concrete example, many conservatives in the United States understand border control in terms of national security, sovereignty, cultural integrity, etc. They often do not understand the interpretations that advocates of open borders base their views upon; things like viewing freedom of movement as an inherent human right, seeing borders as a way that corporations undermine labor, seeing Mexicans as having historically inhabited the American South West, etc. As a result, those conservatives misinterpret advocates of open borders as unpatriotic, attempting to undermine America's sovereignty, attempting to replace their culture, etc. Basically, the issue isn't the disagreement, it's lacking the shared understanding of the situation that would allow discussion of the disagreement.