"You shouldn't eat mud" actually felt like a bad example because it follows from some other widely agreed upon truths like "mud is indigestible" and "mud can contain things that can harm you".
Being indigestible or possibly containing things that can harm you do not mean that you shouldn't eat mud. They mean that eating mud might hurt you, which is not the same at all. If anything it's a bad example because it overlaps with the assumption that human life is precious.
Being indigestible or possibly containing things that can harm you do not mean that you shouldn't eat mud. They mean that eating mud might hurt you, which is not the same at all. If anything it's a bad example because it overlaps with the assumption that human life is precious.