OK, now back to me. I learned from teachers and family that there were people who made it from infancy to adulthood without having seen a television. I learned that for hundreds, even thousands of years, people had no books in their houses. And most had no houses, and books were rare because there was no printing. I learned that scientists suffered because their theories and discoveries disturbed comfortable thinking. I learned that most of the time, people will believe what they're comfortable believing.
If, for example, you believe that your file room is staffed by skilled, dedicated professionals who pay close attention to their work and never lose a folder or a document, you can sign your firm's professional insurance application in good conscience. You don't want to hear from some malcontent with a stamped receipt in her hand that important papers have gone missing. If you believe that your product is beneficial and healthful, you don't have any qualms about shading the description of the strange rashes that afflicted some nervous weirdos after consuming it. If you believe that you have great taste and a fine fashion sense, then it's not a reach to believe that you are doing a good deed by bringing cheap ugly ill-made clothing to the market, notwithstanding Gresham's Law - oh, right, your education was limited to fashion and your high school history course was, um, basic, so the concept that Bad money drives out good also means that crap merchandise drives out good is beyond you....
If you believe that you are an open-minded, clear thinking, good person, you may not notice when your limited experiences lead you to sound like a fool.
Recently someone who (I thought) should have known better, haughtily advised me that Joan of Arc was a legend and never existed in real life.
Um, who was burned at the stake in Rouen by the English in 1431?
Genius insisted there was no contemporary documentary evidence. Like photos.
I began to explain about chroniclers at royal courts and chroniclers who accompanied armies, and stopped. There's no cure for stupid.
Even the teachers whose names I still bless had their failures, and for all I know, they may have thought I was one of such. (But please see change of heart described in opening paragraph. What life has taught me: you can always learn something.)