OK, I think I see it: the revised sentence “The idea that we can confidently argue that there’s no way to make them safe, that seems like nonsense to me” wouldn’t land, because it’s more natural to say that the arguments are nonsense (or “gobbledegook”) than that the idea of such arguments is nonsense.
OK, I think I see it: the revised sentence “The idea that we can confidently argue that there’s no way to make them safe, that seems like nonsense to me” wouldn’t land, because it’s more natural to say that the arguments are nonsense (or “gobbledegook”) than that the idea of such arguments is nonsense.