Hitlers existence altered the political course of the world moreso than any factor of that century, perhaps even in all of history (besides maybe the French Rev). Had the third Reich never risen, god only knows where we'd be today.
Yeah, without Hitler we could have ended up with the Soviet Union directly controlling half of Europe and the other half slowly succumbing to socialism and godlessness until it got so bad that one day even Ireland would do something like making it legal for two sodomites to get married to each other. Thank God nothing like that ever happened. Thanks, Hitler.