This article revisits the collapse of the Weimar Republic through contemporary polarization
theory. It does not offer a new archival explanation but uses a well-studied historical
case to clarify how ideological and affective divisions can escalate into pernicious
polarization and the collapse of democratic trust. The argument is that Weimar was
not doomed by polarization alone. Social-moral cleavages, segmented publics, economic
anxieties, political violence and status fears became democratically destructive when
political actors transformed them into antagonistic camps that increasingly ceased
to recognize opponents as legitimate participants in a shared political order. The
article makes three contributions. First, it clarifies the relationship between ideological,
affective, pernicious and democratic polarization. Second, it interprets the Nazi
promise of Volksgemeinschaft as a strategy of exclusionary unity: National Socialism
did not overcome polarization but reorganized it by redefining the political community
against internal enemies. Third, it differentiates the mechanisms through which Nazi
anti-pluralist mobilization, Communist sectarianism and conservative institutional
bypass eroded mutual toleration, institutional restraint, coalition-building and the
legitimacy of opposition. The Weimar case illuminates how democratic breakdown becomes
more likely when political conflict loses the capacities that make it democratic.
