Why can extremist political parties weaken democratic competition?

Extremist political parties weaken democratic competition by undermining the mechanisms that ensure government accountability and stability. In a healthy democracy, the "loyal opposition" serves as a vital check on the incumbent; however, when extremist parties are perceived as highly undesirable or lack credibility, this electoral check fails, and accountability suffers.12

Extremism further destabilizes democracy by increasing the costs of alternating power. When political competition is framed through exclusionary or identity-based platforms, it often becomes a zero-sum game where losing an election feels like an existential threat. This removes the incentive for political actors to "wait their turn," encouraging them to pursue antidemocratic alternatives or even violence if they believe their preferences cannot be satisfied through standard democratic channels.132

Additionally, extremist movements often replace programmatic, unifying platforms with symbolic, identity-based rhetoric. This fragmentation makes it difficult for governments to enact broadly encompassing policies, as politicians focus on mobilizing core supporters rather than appealing to the citizenry as a whole. By eroding the tradition of compromise, extremism deepens polarization and alienates voters from the political system, ultimately threatening the durability of democratic institutions.132