Why is ignorance seen as such a negative trait amongst humans when ignorance doesn't really determine one’s ability to thrive and survive in society?

Why is it important to stop judging people, and how can that change make me less boring?
How do therapists break through defensive behaviors without making patients shut down?
Why do people idolize successful entrepreneurs without recognizing the role of luck in their stories?
Why are negative people only happy when they bring you down to their level?