Haleivi is doing a fine, although altogether too polite, job. But I’m bored, so I’ll chime in.
1. I’ve lost count on how many times you’ve switched between saying that mistakes in girsos happen, and that they weren’t careful (in the first place) in recording such stories. Are you sure you have a worked-out shita here, or are you just that desperate to give a modern, different, rationalistic approach to every Chazal possible
2. Putting aside the absurdness of your comparison, and of the general mehalchim of Rambam or Meiri, that’s not what he says there.
a)He admits that there actually is an effect due to the belief in them, as the Gemara says about one who is makpid.
b)The gemara isn’t saying something false, its saying that its a safe night (which is true), for the purpose of reassuring those who think there’s a problem, while it may in reality be an UNNECESSARY reason.
3. Sichas Talmidei Chachamim trichim limud. Just because something is said to serve as a mili d’bidichusa does not mean there isn’t what to learn from it.