“As an intellectual character trait that obstructs effective inquiry,” writes Quassim Cassam in Vices of the Mind, “closed-mindedness also looks like a trait that gets in the way of knowledge systematically.”
Cassam writes that closed-mindedness has been extensively studied, which is relatively unique among the epistemic vices that Cassam considers in his book. He uses a deep dive into closed-mindedness to help demonstrate how epistemic vices obstruct knowledge, how they do so systematically, and how epistemic vices can describe people’s actual conduct.
Closed-mindedness is a general obstacle to knowledge by hindering effective inquiry. Being closed-minded or engaging in closed-minded thinking means that we are not making honest and complete efforts to investigate the world around us and answer questions. Instead, we hold onto specific answers that are preformed, that match what we want to believe, or that support another motive of ours. We don’t look for information that may contradict what we want to know and believe, and we discredit such information if presented to us. We fail to truly take an objective and comprehensive view of the situation before making a decision when we are closed-minded.
Closed-mindedness is an interesting epistemic vice because it can be an individualized behavior and also a character trait. As an individual, you might generally be open-minded, making good efforts to think critically about the world around you, however, through biases or other errors, you may from time to time engage in closed-minded thinking. Specific situations and some context-dependent decisions may draw out closed-minded decision-making in otherwise thoughtful individuals.
On the other hand, you can generally be a closed-minded person. You might be someone who always wants to have the last word, to always feel like the smartest person in the room, or to believe that your view of the world is correct and that there is no room for change. In most of your decisions, thoughts, and behaviors, you can be closed-minded, failing across the board to make full inquiry into the world around you. You might be open-minded in some situations or thoughts, but on the whole, you can tend to be a closed-minded person.
Whether it is a single decision or your general epistemic approach to the world, closed-mindedness is likely to obstruct knowledge, and to systematically lead to worse outcomes. A closed-minded army general who won’t acknowledge new information is going to leave his army vulnerable to an attack that he did not expect. A closed-minded sports fanatic is going to place unwise bets that won’t pay off. A generally closed-minded mother is not going to help her child when she fails to accept their errors, creating a situation that could compound small flaws into larger tragedies. Closed-mindedness prevents us from seeing the world clearly and leaves us vulnerable to decision-making based on poor information on a systematic level. As Cassam closes his thoughts on closed-mindedness, he writes, “Closed-mindedness, then, is an intellectual character trait constituted by intellectual dispositions that aren’t subject-specific.”