Common Sense - where has it gone?

So yesterday we spoke of the "limbic" system and how it controls our emotions. Well today we're going to talk about another function or maybe lack of in our body and mind.
And that would be . . . "Common Sense"!
So . . . Where did it disappear to in this great country of ours?
Is "common sense" something we're just born with or is it something we have to learn?
The "Cerebrum" . . . the large outer part of the brain controls reading, thinking, learning, speech, emotions and planned muscle movements like walking. It also controls vision, hearing and other "senses".
The "common sense" part is the link between the body and its senses. So, is lack of "common sense" just something we're missing in the big picture of life?
Psychology Today states: Common sense, defined as "sound judgment derived from experience rather than study", is one of the most revered qualities in America. It evokes images of early and simpler times in which industrious men and women built our country into what it is today.
Wikipedia states: The definition of "common sense" refers to having sound judgment, not necessarily based on specialized knowledge. When you are smart, level-headed and able to understand and assess a situation, this is an example of having a lot of "common sense".
So here it is in a nutshell . . . Common sense is a form of practical decision-making and the ability to imagine the "consequences" of something you do. It "stops" us from making "irrational" mistakes and makes it easier to make good choices on what to do in life.
Okay . . . so we aren't born with "common sense", we must develop it over time.
So the question still remains . . . where did all the "common sense" in this great country go???