Why are they called “grammar Nazis” and not “the Gestypo”?

Why are they called “grammar Nazis” and not “the Gestypo”?

Commentary:
"Isn't it ironic how they missed the opportunity for a more 'polite' terminology? 🤓🚫✏️ #PunnyGrammar"

What do you think of that playful twist on the term?

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