1) Disliking Communists does not make you a Nazi, and from what I've seen the only people who unironically think that are either Pinkos or outright Communists themselves.
2) Last I checked Tanya was
never "the Hitler replacement" of her series. People call her "Loli Hitler" sure, but that's just a joke about her being a german military commander that acts insane and brutal.
She isn't ACTUALLY a Hitler stand-in, she isn't the leader of a country nor does she commit racial genocide, and her goals aren't conquest or power or anything like that, she wants to win the war so she can settle down and retire to a "peaceful life".
3) Tanya is called "Tanya the evil" because she's ruthless on the battlefield and literally told God, the arbiter of good, to fuck himself to his face when she died. Not because she's literally Hitler.
4) Hitler himself only hated Communism because he believed Communism was a Jewish capitalist plot to deceive people away from the "true" endpoint of socialism; Fascism, and he wanted their land and resources. Tanya hates them because they're the enemy in a war, and Kirsche hates them because they're annoying as fuck.
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