the problem with common sense......... wait for it!..... is not that it isnt common, it is that it is untrained by empirical observations and careful analysis. It is easy in many cases when something like dont touch a heated stove is involved but in other cases, when one cannot fathom why a decision is made, we make a gut reaction based on intuition which will lead many astray when examining a more complex problem. Common sense as a benchmark is a very flawed one when we rely on what is innate or what is perceived to be innate. Intuition is something that needs to be trained.