One productive way to look at the differences is to see the similarities. Nazism, Socialism and Communism are all examples of Statism, which, at its simplest, says that the State owns you. They express it differently, clothe it in different rhetoric, but the end result is the loss of individual freedoms.

The opposite would be Classical Liberalism, now known in the US as libertarianism.

Put another way, some people feel they have the right to tell you how to live your life. Others just want to live their own life.

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Never moon a werewolf.