But quantum theory also makes correct predictions, and mainstream physics does not en masse advocate quackery. Vitalism never worked, and it lead the entire medical community to advocate actively harmful quackery for much of the 19th century.
By this line of reasoning almost all past theories can the discredited. People use a theory to make predictions and act on them. Only later do you learn the shortcomings. If you don't have empiricism you don't even have a tool to systematically notice your error. I think this is a fully general counter argument.
Another month, another rationality quotes thread. The rules are: