Regarding the quote from J. K. Galbraith, all I can say is he was a major practitioner of exactly that point. I don't believe he ever ran a single statistical test in his life, I never heard him ever doubt his own beliefs, and I don't believe he ever changed his mind (or at least admitted to changing his mind) on a single point of economics. He tended to regard his own private observations has infalliable evidence. One could do a major study of bias just studying the work of Galbraith. Galbraith is a great example of how a large ego is the greatest barrier to seeking truth. The world needs more genius, but it needs more humility more.