How does Shakespeare's tyrant Macbeth compare with a tyrant of the twentieth century?

It could be argued that Macbeth shares some characteristics with a murderous twentieth-century tyrant like Joseph Stalin or Adolf Hitler. While neither of these men murdered the rightful rulers of their respective nations, they certainly used violence to maintain their grip on power. Both men ordered bloody purges that victimized even some of the people that supported them in their rise. Macbeth, once in power, attempted to purge his enemies and potential enemies as well. He had Banquo and Macduff's wife and child murdered solely because he deemed them threatening to his power. Like Hitler, Macbeth's murderous deeds eventually caught up with him. Defeated and hiding in a bunker, Hitler took his own life in 1945. Macbeth, of course, was killed by Macduff, who thus avenged his murdered family. Beyond this, it is hard to say much about Macbeth's ruling style. He is, however, described as a bloody tyrant who has all of Scotland living in fear, and this could pretty obviously be said of several twentieth-century dictators.