I would like to take this time to point out that in my 25 + years of practing medicine. Many therapies that are currently in practice and some majorly wrong, but many that are (we think) correct, came from the same type of thought process.
As the Dean of my Medical School said in his first lecture to us (the first week of classes) "Just remember, at least half of what we think we know about medicine is wrong! The Problem is we have no way of knowing which Half!!!".