And yet, the proponents for it's effectiveness have yet to provide any evidence that it's worth studying. People who have no reason to believe it will work don't have a lot of incentive to test whether it works. Then again, the people who benefit from it's popularity and don't care if it works don't have much of an incentive to test it either.

The key was in my last sentence: "Until and unless they can produce such evidence, it's only right to criticize those promoting the treatment."