I don't believe that you are viewing the connection or the understanding as an object unto itself. You insist that there must be some other objective, if I'm not mistaken. Relationship is the entire objective.
I think it is a mistake to completely discount the validation of others. While being completely reliant upon external validation is a mistake - and in fact, a personality disorder - the balance of one's own values and self-opinion combined with the perspectives and validations of others helps us to learn more about the human experience both for ourselves and for others. My life isn't fulfilling if I cannot maintain some sort of social perspective and connection to others.
If you need an objective to why this would be necessary, take into account jobs like psychologist, pastor, hospice care worker, parenting, early childhood worker, adolescent guidance counselor, addictions counselor, death row counselor, corrections officer, writer, artist, musician, and any other occupation that a person could acquire in which making deep connections, providing understanding, and comprehending the emotional complexity of the human experience is paramount. You could probably even include "forum moderator" into that mix, not to mention simple, basic things like friend and lover.