We're all drawn to someone who shows confidence - that is the reason that narcissists are more likely to be promoted or get elected to political office. But on its own, narcissism is dangerous. It tends to promote overconfidence and it dismisses the criticism.

Narcissists believe they're unique and superior, while humble leaders know they're flawed. 

Admitting the flaws of your ideas makes it tougher for others to come up with their own objections, often resulting in proposing solutions to your problems.

Performance humility is admitting that you fall short and make mistakes.

When we focus on hiring people who fit the culture, we end up with people who are similar to us. That prevents the diversity of thought and background.