This line of reasoning is ridiculous and I will give an analogy. Pick an ancient "wisdom" at random. What probability do you assign to this belief being true?

This line of reasoning is ridiculous and I will give an analogy. Pick an ancient "wisdom" at random. What probability do you assign to this belief being true? You get "throwing salt over your shoulder increases luck." Obviously ridiculous right? You aren't going to actually do it just cause "the ancients" said it was good. Now imagine some study comes out saying that exposure to salt in the air actually increases your something-or-other levels making you healthier. Ha, the ancients were right (kinda-sorta, about one thing, and for the wrong reasons, and with the wrong predicted effect)! All modern science must be wrong and all ancient wisdom must be correct! Proof we must go back to draining blood to to treat diseases and stop abandoning ancient practices.