Ignorance becomes a big deal when you find yourself in a pit and you discover that you can't get out simply because you don't know how to get out. If you think schooling and education are the same, then consider that:
Only few people study Accounting or Economics but all of us have financial issues
Even though the study of Medicine and/or Anatomy is a no-go-area for many, we all have a body to maintain and health issues to deal with
We might not be social scientists but we have dealings with people everyday
You don't relish speaking in public but one day you might be asked to say he closing prayer or give the vote of thanks or perhaps be the MC at your friend's birthday party.
The big question of life is, "How do you manage the different aspects of your life effectively?" The answer is simple, yet it's a big deal.