Evidence has smashed my belief's face quite solidly in the nose, though.
Evidence other than the repeated denials of the subjects in question and a non-systematic observation of them acting as largely rational people in most respects? (That's not meant to be rhetorical/mocking - I'm genuinely curious to know where the benefit of the doubt is coming from here)
"I knew eating a cookie wasn't good for me, but I felt like it and so I did it anyway."
The problem here is that there is a kind of perfectly rational decision making that involves being aware of a detrimental consequence but coming to the conclusion that it's an acceptable cost. In fact that's what "rationalizing" pretends to be. With anything other than overt examples (heavy drug-addiction, beaten spouses staying in a marriage) the only person who can really make the call is the individual (or perhaps, as mentioned above, a close friend).
If these people do consider themselves rational, then maybe they would respond to existing psychological and neurological research that emphasizes how prone the mind is to rationalizing (I don't know of any specific studies off the top of my head but both Michael Shermer's "The Believing Brain" and Douglas Kenrick's "Sex, Murder, and the Meaning of Life" touch on this subject). At some point, an intelligent, skeptical person has to admit that the likelihood that they are the exception to the rule is slim.
If these people do consider themselves rational, then maybe they would respond to existing psychological and neurological research that emphasizes how prone the mind is to rationalizing (I don't know of any specific studies off the top of my head but both Michael Shermer's "The Believing Brain" and Douglas Kenrick's "Sex, Murder, and the Meaning of Life" touch on this subject). At some point, an intelligent, skeptical person has to admit that the likelihood that they are the exception to the rule is slim.
Psychological research tends ...
Anna Salamon and I are confused. Both of us notice ourselves rationalizing on pretty much a daily basis and have to apply techniques like the Litany of Tarski pretty regularly. But in several of our test sessions for teaching rationality, a handful of people report never rationalizing and seem to have little clue what Tarski is for. They don't relate to any examples we give, whether fictitious or actual personal examples from our lives. Some of these people show signs of being rather high-level rationalists overall, although some don't.