In "How Democracies Die," Steven Levitsky discusses the critical role of gatekeeping institutions in maintaining democratic governance. These institutions are responsible for vetting individuals who seek positions of power, ensuring that only those who respect democratic norms ascend to leadership roles. When these institutions fail to function properly, it poses a significant risk to democracy. As a result, it becomes crucial for mainstream politicians to act decisively to prevent extremist or dangerous figures from gaining influence and access to power.

Levitsky argues that mainstream politicians have a duty to protect democratic systems from threats that arise when gatekeeping mechanisms weaken. They must remain vigilant and proactive, working together to safeguard democratic institutions and values. This involves a collective effort to draw clear boundaries against those who might undermine democracy, thereby preserving the stability and integrity of governmental structures. Ultimately, ensuring the health of a democracy requires continuous commitment from its political leaders to defend against potential dangers.