Prove that we don't live on a flat earth
The problem with this approach is that they reject facts and rational thought. Nothing will convince them; they have made up their mind. Therefor arguing with them is a waste of breath.
So you don't feel any sense of responsibility to guide them back from the edge of insanity? Just let them see out their lives in ignorance?
@Tijs started
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Prove that we don't live on a flat earth