what would happen if rationalists believed otherwise than what they believe
They wouldn't be rationalists anymore, duh.
Taboo "rationalists": What would happen if you stopped trying to change your map to better reflect the territory? It most probably would reflect the territory less.
Is the answer simply "they would be normal people, like my psychologist"?
"Normal people" are not all the same. (For example, many "normal people" are unlike your psychologist.) Which of the many subkinds of the "normal people" do you mean?
Some things are unrelated. For example, let's suppose that you are a rationalist, and you also have a broken leg. That's two things that make you different from the average human. But those two things are unrelated. It would be a mistake to think -- an average human doesn't have a broken leg; by giving up my rationality I will become more similar to the average human, therefore giving up my rationality will heal my leg.
Replace "broken leg" with whatever problem you are discussing with your psychologist. Do you have evidence that rational people are more likely to have this specific problem than irrational (but otherwise similar: same social background, same education, same character, same health problems) people?
Taboo "rationalists": What would happen if you stopped trying to change your map to better reflect the territory? It most probably would reflect the territory less.
That's a behavior and no belief.
It most probably would reflect the territory less.
There are many instance where trying to change a belief makes the belief stronger. People who are very much attached to their beliefs usually don't update.
Many mainstream professional psychologist follows a code that means that he doesn't share deep information about his own private life with his ...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.