I think the trouble is that even educated humans struggle to talk intelligently about medical and psychological problems. We all worry about our health and mortality, and the idea that a psychological or medical condition threatens your life is somewhere between an existential threat, and a worrying cloud over your life. As a result, people easily become wedded to the idea that a particular condition is affecting them, or someone close to them. And they lose their normal objectivity when it comes to swallowing up medical jargon and scientific-sounding names for nebulous psychological / educational phenomena.