Half our society believes that “experts” are stupid elitists who don’t know what they are talking about. It’s much easier to believe whatever you want to believe than learn about a subject. No wonder so many people think you are “being a dick” if you point out their unsafe practices.
On the other hand, many people simply have no idea how much there is to know. If you strike up a conversation, it usually doesn’t take long before they want to learn everything you know.