And, importantly it does not depend on reason itself. People don’t have to have any understanding of why they believe what they believe for what they believe to be usefully true. That is, operating as if the world was this way informs you about the world.
A reasoned theory of the world should acknowledge this anchor. In some way our reasoning should accommodate common sense. Either as a special case, or as an approximation, or as a local maximum or something.
Otherwise, you have a hard time explaining why common sense has stood the test of time and cultural selection."