It turns out that common sense isn't as common as it used to be. Now it's a different kind of sense that one typically encounters - nonsense.
There's a bumper sticker I've seen that says: Common Sense is so rare it should be declared a super power!
Perhaps "common sense" is the problem. It is sold on the same rack as "common knowledge:" no proof or reason required. You just know that guns are bad.
I had wanted to include the only Heinlein quote I could find on common sense, and now that brother jk has teed it up:
"I was just trying to show you," he went on, "just how insubstantial a 'common sense' idea can be when you pin it down. Neither 'common sense' nor 'logic' can prove anything. Proof comes from experiment, or to put it another way, from experience, and from nothing else." Chapter 10, "The Method of Science" (p. 105)
From the book 'Rocket Ship Galileo' (1947) which I haven't read. dagny?
Probably read it. Don't remember it.