There's a fear of inferiority that lies behind so much misinformation. We don't want our truest selves, our real, flawed selves to be criticized, so we use dishonesty to create protective barriers. In much the same way, the Dodo character in Alice in Wonderland attempts to conceal his ignorance with confidence.
When threatened with real or imagined criticism, lies offer a first line of defense. Our artifices keep us safe and untried.