Germany came out from under Hitler because the nation was defeated, then utterly defeated in 2 global wars. Prior to that they were a very young nation cobbled out of many different principalities, but with some common identity as German. They had to remake their society in the late 1940's and did so with the help of the United States, France, Britain, and Scandinavian countries. They created a much stronger central government than the Wiemar Republic, and infused it with a great many social democratic policies. They are a best case scenario and were ready for the form of government they have now. They are fighting to keep it.
Russia has not had it as easy, they went from monarchy, to anarchy and civil war, to brutal totalitarian rule for decades, to a period of slight freedom, and back to totalitarian rule, but with money and some new comforts. I am no Russian history buff either, but I do not see the traditions of freedom and individual liberties being strong within the Russian culture the way that they are in the United States, if only in concept.
North Korea is similar to Russia in that they have had a more monarchical history with many invasions and struggles to gain their independence from Japan, then China, etc... The Kim family has set themselves up as religious figures within the society. We talk about the "cult of personality" here in the States and how people are blindly following Trump, or Reagan, or Obama, etc... but nothing like what North Korea has been since the defeat of the Japanese in 1945.
The US has a history of resisting despotic rule, if only in our heads. Though we are by no means immune to becoming an authoritarian state, we are not as susceptible as Russia and North Korea.
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