Below, excerpts from an article by Philip Fernbach and Steven Sloman:
On their own, individuals are not well equipped to separate fact from fiction, and they never will be. Ignorance is our natural state; it is a product of the way the mind works.
What really sets human beings apart is not our individual mental capacity. The secret to our success is our ability to jointly pursue complex goals by dividing cognitive labor. Hunting, trade, agriculture, manufacturing — all of our world-altering innovations — were made possible by this ability. Chimpanzees can surpass young children on numerical and spatial reasoning tasks, but they cannot come close on tasks that require collaborating with another individual to achieve a goal. Each of us knows only a little bit, but together we can achieve remarkable feats.
Knowledge isn’t in my head or in your head. It’s shared.
Consider some simple examples. You know that the earth revolves around the sun. But can you rehearse the astronomical observations and calculations that led to that conclusion? You know that smoking causes cancer. But can you articulate what smoke does to our cells, how cancers form and why some kinds of smoke are more dangerous than others? We’re guessing no. Most of what you “know” — most of what anyone knows — about any topic is a placeholder for information stored elsewhere, in a long-forgotten textbook or in some expert’s head.
One consequence of the fact that knowledge is distributed this way is that being part of a community of knowledge can make people feel as if they understand things they don’t.
The sense of understanding is contagious. The understanding that others have, or claim to have, makes us feel smarter.
The key point here is not that people are irrational; it’s that this irrationality comes from a very rational place. People fail to distinguish what they know from what others know because it is often impossible to draw sharp boundaries between what knowledge resides in our heads and what resides elsewhere.
This is especially true of divisive political issues. Your mind cannot master and retain sufficiently detailed knowledge about many of them. You must rely on your community. But if you are not aware that you are piggybacking on the knowledge of others, it can lead to hubris.
Such collective delusions illustrate both the power and the deep flaw of human thinking. It is remarkable that large groups of people can coalesce around a common belief when few of them individually possess the requisite knowledge to support it. This is how we discovered the Higgs boson and increased the human life span by 30 years in the last century. But the same underlying forces explain why we can come to believe outrageous things, which can lead to equally consequential but disastrous outcomes.
That individual ignorance is our natural state is a bitter pill to swallow. But if we take this medicine, it can be empowering. It can help us differentiate the questions that merit real investigation from those that invite a reactive and superficial analysis. (…) A better understanding of how little is actually inside our own heads would serve us well.
See also: Collective Implicit