Do you really believe you have a monopoly on the truth?
No. I think absolute truth is an illusion and the most you can hope to achieve is a best version of it based on what is currently known. I think truth is something that you have to continually seek and be open to re-evaluating based on the quality of the evidence you have.
If I walked into a room of strangers and was told that group over there has an ideology in which they have a sure belief and that group over there has no sure beliefs but are exploring ideas and information—it's the second group with whom I'd like to chat. I'm more interested in people whose eyes, ears, and minds are open to new information and who regularly question their own assumptions than in blind parrots that just repeat the same phrases over and over without hesitation or thought. Parrots make a lot of noise, but you can't learn much from them.
Unfortunately, There are people who have an emotional fear of uncertainty. They tend to get sucked into fundamentalist ideology or cults and are comforted by narrow points of view that make the world easier to understand. They see the world in simplistic black and white terms which facilitates finding comfort in certainty. They run away from complexity by covering it over with a thin veneer of labels and stereotypes to enable their simple and repetitive talking points. Others may just be too intellectually lazy and use ideology as a crutch in order to have an opinion about everything without much effort. In either case, ideology,
especially the fundamentalist type, becomes welded to self-identity and is difficult to penetrate for that reason. The current Trump cult is only one of many examples currently and throughout history.
The belief that any person or ideology has a "monopoly on the truth" is a fantasy born of delusion. The world is complex and getting more so all the time. Anyone believing they can grasp all of its complexity is lying to themselves.