@aral Accurately explained in Cathy O'Neil's 'Weapons of Math Destruction':
"Vulnerability is worth gold. It always has been. Picture an itinerant quack in an old western movie. He pulls into town with his wagon full of jangling jars and bottles. When he sits down with an elderly prospective customer, he seeks out her weaknesses (...) With this knowledge, he knows he’s halfway to a sale before even clearing his throat to speak.