We are not in any way immune to these kind of things. Early 20th century Russia or Germany are not some kind of parallel universes that operates on completely different conditions than the modern Western world.
These events happened less than a 100 years ago, and in the case of Germany, in a leading industrial Western country. "It can't happen here"-type of arguments are not very comforting.
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Nothing is impossible, it's just a matter of probability.
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