The same problem exists from the other end. How many traditional ideas are useful and true vs. how many have been clearly shown to be useless or destructive non

The same problem exists from the other end. How many traditional ideas are useful and true vs. how many have been clearly shown to be useless or destructive nonsense? If you need examples of the latter the most fruitful area to search is probably traditional medicine. Pre-enlightenment medicine provides an abundance of things that don't work or are downright harmful. Producing such tallies would be extremely difficult. It's hard to even classify complex ideas as traditional or radical/rational. Is communism traditional or radical? At first glance it's quite novel but it's full of ideas and sentiments that closely resemble those found in many religions and more tribal or family oriented cultures. The idea of collective ownership wouldn't be that foreign to a nomadic culture, and those are among the most traditional and oldest societies on Earth. One could argue it's a mere modern repackaging of a lot of extremely old ideas.