90% of Americans believe at least one conspiracy theory

I think there are legitimate applications that fit the description, but yeah, 99% of what's out there is junk.
And that’s an important distinction
Even the article mentions placebo effects and other benefits- a person being an active participant in their own health is mostly a good thing (as opposed to someone looking for a silver bullet to better health)
Throwing the baby out with the bath water seems as ill advised as blind adherence