I can't help but ponder the political environment in which a German, Fritz Lang, creates this film. In 1931 the rise of Nazi power and Hitler as it's protagonist must have certainly influenced this German/Austrian film maker, screenwriter, film producer and actor. The culture was certainly changing and it is interesting that Hitler eventually becomes the largest murderer of innocence in all of Europe. This is just what pops to mind as a possible precursor to the theme of "M". The murder of innocence.