I feel, because we can never connect our minds to another’s and experience each other’s emotions, or read through their life in such depth as we can call upon our own memories, that we are all alone. We have words and other forms of communication that are, quite frankly, at best gross cudgels with with we shape society and the people around us. Take art as an example, why do we all not universally get the same inspiration or message from reading the same book or seeing the same painting? The artists poured their soul into their work over years, carefully working within the limitations of language and other external senses to craft, what is to them, a profoundly moving piece that was meant to inspire/enlighten others. Yet, try as I might, I still find poetry to be boring and unmoving.
Now to try and tackle your question, we both must work from the same definitions. We agree that there are endless gradations (shades) of meaning, from the most general to the most specific? If I asked you “what is closed-mindedness?” And you answered, “it is a person’s unwavering conviction in what they already believe despite the amount of contrary evidence shown to them.” Then that would still have not answered my question, because in my head I wanted an answer to a deeper question, what I unsuccessfully tried to ask was more like “even after some introspection I do not know why I, myself, internalize some information as truth with less rigor and skepticism as I do at other times with other bits of information. Have there been any psychology experiments done about this subject to help tell me why myself and other people need varying amounts/types of evidence/experience before our innate ‘gut feelings’ are overruled and slowly switched over to the new way of thinking?” Unfortunately, I do not know, so if anyone else has some of those papers I would like to read them.
I think that open/closed-mindedness is a form of protecting your own inner strength/drive. What makes you get up in the morning and be a productive person in our society rather than being a homeless, criminal, or a NEET (Not in Employment, Education, or in Training)? Did you learn at an early age from your parents/society/culture/etc that doing all those good habits (work, study, save for the future, respect your elders, praise God, have a family/children, don’t lie or steal, etc…) would lead you to having a good, fulfilling, life? Did you then later learn, through repeated consistent exposure to the real world, that some of those things are not necessarily true? To close your mind early and shrug off the injustices of the world, would make you good for society as a whole. To open your mind to the suffering and the possibilities of cheating the more idyllic thinking people, would allow you to further your own life and your family’s wellbeing. Why did you choose the balance that you did? Is the government all the God and Justice you need? What if you were presented wave after wave of various evidences that being true scum or giving up on life was the only satisfying answer? How open or closed would your mind be to rejecting everything you knew to be true, in favor of the promise that the new 180 degree bizarro you would be magnitudes happier? Now reflect upon that when we do the same thing to criminals or the suicidal or the religious and expect them to follow us towards our “enlightenment.”