Flat Earthers and what to do with them

But some of those therapies can poison and kill, which the alternative therapies people will never acknowldge.

Yup, a lot of them have properties that can actively interfere with drugs with proven effectiveness, causing harm even if the person isn't actively shunning conventional treatment.

I have a feeling that most of these conspiracy theory lovers don't get on with Occam's razor as a concept.