The internet, with a touch of the finger, brings us the great libraries of the world, its newspapers, its magazines. It provides search engines and other tools that allow us quickly to locate whatever we want to read.
Indeed, the internet is the greatest reservoir of instantly available information and ideas the world has ever seen.
It should make each of us wiser — better equipped to be thoughtful members of a democratic community.
But one human weakness makes the internet, instead, perhaps the greatest threat democracy has ever faced.
The human weakness causing me, a lifelong optimist, to despair is our universal desire to see ratified our own opinions and biases. Psychologists call it the "confirmation bias."
Because of confirmation bias, we are tempted, when tapping into the internet, to visit only sites that reaffirm our pre-existing views, that share our biases, that confirm our beliefs. It means we ignore sites that might give us reasons to question our assumptions, to rethink and perhaps to moderate the political and social attitudes we embrace.
The internet allows each of us easily, effortlessly, to find reassurance for even our most ill-founded and destructive misunderstandings.
Compounding the problem, anyone who wants to exploit confirmation bias can create an internet site to inflame the biases that infect a given community and make that site easy for the target audience to visit.