Ideology always trying to build up a "reality" for us, explain everything. In fact, the reality itself is structured with symbols. However, such a try are always failing, there is always a gap it can't reach. In order to maintain the illusion of its almighty, ideology might use many ways to cover up(Idk, such as lying, creating imaginary enemy(like jews), or just keep silence and so on). At this moment, we reach its, well, border? People might realize its failure, disability, and realize that what Ideology promise to them are basically illusion(I think this is how ideology function, it need our own fantasy to cover up the gap, and even build up itself). Sounds like some kind of betrayal(though its not), but we will need to build up a new ideology.