The article doesn't provide details, but it would be interesting to know what percentage of the test subjects, if any, did in fact change their view in light of new evidence. Surely some people are more rational than others.
Ross, L., Lepper, M.R. and Hubbard, M. (1975) Perseverance in Self-Perception and Social Perception: Biased Attributional Processes in the Debriefing Paradigm. Journal of Personality and Social Psychology, 32, 880-892.
https://sci-hub.st/https://doi.org/10.1037/0022-3514.32.5.88...
Anderson, C.A., Lepper, M.R., & Ross, L. (1980). The perseverance of social theories: The role of explanation in the persistence of discredited information. Journal of Personality and Social Psychology, 39, 1037-1049.
Also, quite a bit of what we class as mental illness seems to be an overabundance of rationality. The existential dread of the depressed. The questioning of societal norms by autists. Neither are wrong, but both are socially dysfunctional.
Then, there are those of us who just can’t hack belief. “Just trust me, it’s true” was never an acceptable answer, and so I was a kid full of “why”, and am the same as an adult. If it can’t be explained, rationally and coherently within the context of everything else, it just gets put in a “maybe” pigeonhole and awaits further evidence or information. I form hypotheses, but they are not precious to me - I suppose for me because my identity isn’t tied to any concept in particular, and I’m quite acceptant of myself as a remarkable yet purposeless molecular Heath Robinson contraption. I also doubt that I am alone.
Am I perfectly rational? Lord, no. Do I think I manage a higher level of rationality than most, and have an… “unusual” life to show for it? Sure.
Everyone is different in every way, though the difference isn't always enough to matter.