Is your position that believing in untrue things has no physical (non-societal) negative consequences? If your sister thinks the crystals are going to cure her

Is your position that believing in untrue things has no physical (non-societal) negative consequences? If your sister thinks the crystals are going to cure her cancer, that's going to impact HER quite a bit. I would assume losing her to disease would impact you, right? When parents refuse to take their children to the doctor for medical expertise, and instead give them coffee enemas, is that "what makes the world fun" in your eyes?