Sometimes people don't want to hear the truth because they don't want their illusions destroyed

He who knows not and knows not that he knows not,
is a fool: shun him.
He who knows not and knows that he knows not,
is ignorant: teach him.
He who knows and knows not that he knows,
is asleep: wake him.
He who knows and knows that he knows,
is a wise man: follow him.

Persian proverb