"It's like this: science requires a tolerance of failure. If your shiny, happy hypothesis fails to stand up to rigorous scrutiny, you drop it and move on. If instead of a true, disposable hypothesis, you have a fixed belief that will not change based on the data, you are delusional. Boosters of alternative medicine prefer the term 'maverick' to 'lunatic' but in the two are often the same.
It is nearly impossible to get someone to abandon a belief in alternative medicine, no matter how strong the evidence against it. Study after study has failed to validate homeopathy as anything other than bullshit, yet it's strongest supports hang on hoping, perhaps, that someone will find out that we were wrong about physics and chemistry all along (you know, regional changes in physical constants and all that). Not all alternative medicine boosters are cynical thieves. Some really do believe that they are doing science, when in fact they are deceiving themselves about the meaning of data. When this type of thinking occurs in medicine, rather than leading to a paper retraction, it leads to quackery and sometimes death."
-- PalMD, surprising even me with this straight talk - it's so rare - though, I guess, that's what should be expected from The White Coat Undergroud.