I've also found that once a person has attained a certain amount of knowledge, sharing it with others becomes an awful lot like telling them that they're wrong.

I've also found that once a person has attained a certain amount of knowledge, sharing it with others becomes an awful lot like telling them that they're wrong. People don't like to hear that they are wrong about things. Sometimes people just don't want to know what they don't know. Its just easier that way. Sharing can be hard, socially risky work. It often requires a great deal of tact, even when the knowledge is asked for.