Yes those things can be taught and they are being taught all the time. But, what portion of that really manifests into actual leadership and changing the world?

Yes those things can be taught and they are being taught all the time. But, what portion of that really manifests into actual leadership and changing the world? You give an example of Scouts - did they ever become anything in their lives and change the world? Some do and some don't. There is no definitive data that says you can go to a class, read a book or talk to someone and become a leader. In fact the opposite is probably true. Leadership is an abstract quality that cannot, in my opinion, be actively managed. It just exudes from the person as they try to solve the problems, execute their vision, and build a rapport by delivering on promises. "Fake it until you make it" doesn't work actually work for most cases and neither do listening to lessons on leadership or reading a particular book.