They don't/can't believe they are incompetent, which adds another dimension to the entire story. "One must beware of anyone who is both stupid and hardworking;

They don't/can't believe they are incompetent, which adds another dimension to the entire story. "One must beware of anyone who is both stupid and hardworking; he must not be entrusted with any responsibility because he will always only cause damage" - Hammerstein-Equord So how to deal with such people? Society hasn't come up with any great answer so far.