Why Common Sense is Uncommon

I'm going through a bunch of old papers since I have some free time this week.  One of the things that I came across were some notes from 18 months ago regarding a book I thought would be interesting to write.  The working title at the time was "Why Common Sense Is Uncommon" or "Why Common Sense Isn't Common".  I don't want to lose the notes so I'm posting them here in case I ever decide to return to this project.

• Define "common sense" - likely lots of definitions of common sense and lots of different opinions regarding what it would be in a given situation
• Why overriding parental instincts?
• Why a bunch of 150 IQ people in a room make a 75 IQ decision?
• Why we make things harder / more complicated than they need to be?
• Why have we taken common sense or judgement out of a lot of processes or decisions? Whose definition of common sense?
• IQ vs EQ
• Why do we question our own judgement?
• Peer pressure, keeping up with others, herd mentality
• Why do we buy things we know we can't afford?
• Why do we do things that we know going into it will end badly?
• Why does something seem totally obvious and "common sense" to one person but not to others?
• How can someone be really smart but lack common sense?
• Find examples of big and small decisions / situations where common sense didn't prevail
• Common sense guide to X
• Why is it that a lot of management / business frameworks / books seem obvious / common sense when we see them but they weren't obvious before that?
• Why isn't common sense common practice?
• Occam's razor - simplest solution is usually the right one
• Are there situations where a common sense approach / solution doesn't make sense?
• Why do we make things more complicated than they need to be by making decisions by committee? Like big family trying to decide what to do. No one wants to make the decision so no decision is made or it's an amalgamation of everyone's ideas. Trying to please too many people.
• Role of "following one's instincts" or "listening to one's gut" - when does it make sense, when can it get us into trouble and how do we know the signal is coming in clear vs our minds taking over and overriding our instinct / gut
• Even if something is obvious or common sense, why don't we do it? Are we worried about conflict (like firing someone or changing their role? Are we worried about not having enough data or evidence to back up our decision if it goes bad?
• Steve delC - a good theory is one that you attempt to disprove and can't 

As I read back over these notes, this still seems like it would make for a good book.  I'd be interested in what others think.  Also, if someone takes this idea and turns it into a book before I can, please do me two favors: (1) make the book good and (2) mention me in the acknowledgments.