The reason is often that you regard your own perceptions and conclusion as trustworthy and in accordance with your own aims—whereas you don’t have a very good reason to believe the other person is operating in your interests (rather than selfishly trying to manipulate you to serve their own interests). They may reason in much the same way.
Probably much the same circuitry continues to operate even in those very rare cases where two truth-seekers meet, and convince each other of their sincerity.
The reason is often that you regard your own perceptions and conclusion as trustworthy and in accordance with your own aims—whereas you don’t have a very good reason to believe the other person is operating in your interests (rather than selfishly trying to manipulate you to serve their own interests). They may reason in much the same way.
Probably much the same circuitry continues to operate even in those very rare cases where two truth-seekers meet, and convince each other of their sincerity.