The more that people have bought into propaganda and feel like they have made appropriate but painful sacrifices because of it, the harder it will be for them to admit they have been seriously duped. There is a science to this. Study the history of propaganda.

The more social confirmation people receive, the more it validates their sacrifices and the more they will tend to encourage others to also make the sacrifices. Study the history of propaganda.

The more that people encourage others to make the sacrifices, the more they become normalized and the more it becomes socially unacceptable to question it. Study the history of propaganda.

Most people are too weak-willed to go against the social norms of their in group. It is a risky and lonely strategy to break away from the herd. But the ultimate winners in any major struggle are those who do exactly this.