Would understanding Mussolini and Stalin as "the chieftain type" leaders have helped Roosevelt or Churchill formulate more effective ways to cope with them? I doubt it.
But Allen Dulles and other guys in the spy business would probably like Jung's kind of profiling -- you know, the kind of guys who told us that Saddam Hussein had weapons of mass destruction in Iraq. But Saddam Hussein was undoubtedly the chieftain-type leader, like Mussolini and Stalin, not the medicine-man leader type like Hitler.
In any event, I take Jung's characterization of Hitler as the medicine-man leader type to mean that Jung saw Hitler as embodying an aspect of the spirit of the shaman that Robert Moore and Douglas Gillette discuss in their book The Magician Within: Accessing the Shaman [Archetype] in the Male Psyche (1993).
I take Jung's characterization of Mussolini and Stalin as the chieftain-type leaders to mean that Jung saw them as being warrior-kings in spirit. Warrior-kings combine aspects of the archetypal energies that Moore and Gillette discuss in their book The Warrior Within: Accessing the Knight [Archetype] in the Male Psyche (1992) and The King Within: Accessing the King [Archetype] in the Male Psyche (1992; rev. ed. 2007).
In the Homeric epic the Iliad, the chief male Greek characters are portrayed as warrior-kings: Agamemnon, Achilles, Odysseus.
In the Hebrew Bible, Moses is portrayed as one example of the shaman-type leader. But King David is portrayed as one example of the warrior-king.
In the Christ myth in Christianity, in the Second Coming, the Christ figure is envisioned as the triumphant warrior-king
Now, according to Dr. Sherry, Burckhardt and many German intellectuals singled out "the Jew" as "the prime catalyst of the process of modernity" (page 25). Modernity here appears to mean late 19th century and early 20th century. (However, in certain other places in the book, modernity clearly refers to the Enlightenment.)