I disagree with YOUR common sense. I have what *I* consider
   common sense and others of a what might just be a different "us"
   category than your "us" category.

   In short, there are two hypothetical books.

   My book has the words COMMON SENSE on it.
   Your book has the words COMMON SENSE on it.

   They're both common sense.
   But you can't see my book, and I can't see yours.
   Hence, we're having a real discussion to figure each other's
   books.