Why is it said that the disintegration of a regime begins with ideological understanding?

Because the establishment and consolidation of a political power lies in the fact that its political program and governance concepts are widely recognized by social elites and the people, and are voluntarily observed and implemented.

Once the broad social elites and people generally doubt and waver about the existing political ideas, they will hinder and oppose the implementation of the existing political system, causing the regime to collapse and disintegrate.