
anon
Would you say that there is mystical harm in factually wrong beliefs, regardless of whether or not you know them to be wrong? Additionally what about incorrect statements regardless of whether or not you believe them to be true? Putting aside normal practical reasons not to want to be wrong.
ignoring whether you know they are wrong, it would define what you mean by wrong. Ethically wrong would be considered negative regardless, factually wrong would likely be dismissed as a different school of thought rather than being flat wrong.
Incorrect statements is different, that's about you stating something, as in you are saying something with the intent of it being taken as fact. If you state something incorrect, it will cause harm regardless of whether you actually believe it. See: anti-vaxx