Message B had a crucially different landscape when it was established: It knew about Message A. The opposite is not true. If we assume general benevolence of h

Message B had a crucially different landscape when it was established: It knew about Message A. The opposite is not true. If we assume general benevolence of humans, Message A had no evil when it was established, it was a genuine mistake, so Message B is true. Now if we assume some part of evil, Message B was crafter by evil actors who, even in the presence of more information than Message A, still entered additional false information in this world.