If you say something like, “Reason taught me that I should value the wants of others as I value my own wants”, I won’t believe you. Reason can’t do that. It might teach you that your own wants will be better-satisfied if you help other people with their wants. But that’s different.
You may have an overly narrow view of what is usually meant by the word “reason”.
You may have an overly narrow view of what is usually meant by the word “reason”.
No. Saying that reason taught you a new value is exactly the same as saying that you logically concluded to change your utility function.