So....Hitler's party *initially* did come to power through a democratic election, but the democratic institutions in Germany did not remain so very long after that. The country was very quickly turned into a dictatorship through Hitler's appointment as Chancellor and through the passing of the Reichstag Fire Decree and further legislation after that.

However, it is utterly naive for anyone to assert that "democracies do not go to war with each other". :D They most certainly do, and for the usual reasons (money, resources, trade, empire, competition, etc). I'd have to figure that you were joking or being ironical, Keith, when you said that democracies don't go to war against each other. All it requires is to convince a very slender majority of the public to go along with the war, and that is generally accomplished by skillful use of media and propaganda.