The efforts of Dr. Archie Cochrane, in finding treatment for the prisoners by isolating vitamin D or identifying home as the suitable place for treatment of heart patients, are good examples of success of trial & error method. Incidentally, almost all the inventions and discoveries have come either through trial & errors or out of serendipity.
The God Complex, as it turns out from Tim Harford’s video, is a belief of the role-holder that he or she fully understands how the system works and only his or her solution to the problem is right. Such persons feel hurt if their opinions are challenged. But, Dr. Cochrane preferred relying on evidence-based decisions, i.e., finding out the best course of action