Quack:
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A practitioner who suggests the use of substances or devices for the prevention or treatment of disease that are known to be ineffective.
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A person who pretends to be able to diagnose or heal people, but is unqualified and incompetent.
https://www.medicinenet.com/quack/definition.htm
Maybe we should start using that term more often.
There was a time when 'quacks' got run out of town. Where we are now is where the medical system has been heading ever since Rockefeller took it over in the early 1900s.