History

The fact that "to each his own" seems like a valid phrase for it is the problem with your reality and the way it has been constructed for you. The Soviet Union did not have the luxury of saying "to each their own" about Nazi Germany. They had to fight it and took great losses in doing so. And the fascists, the nazis, the colonialists of the world never forgave them for it; they vilified communism as a horrible evil, made up grand lies about it, and acted like the US, which entered the war very late, was some kind of key force in defeating Nazi Germany. The same US that took on former Nazis with Operation Paperclip. The same US which the Nazis learned from when making discriminatory laws, learned from the US's Jim Crow laws.

The sort of people who are cut from the same cloth as Nazis, who collaborated with them during and after the war, would like you to believe that peoples who took great losses in defeating Nazi Germany are actually the villain. Once you understand it like this, it's so much more clear what the dynamic is and it resolves the bizarre mental gymnastics of believing that the same Soviet Union that fought Nazi Germany is somehow "just as bad because waves con artist hands communism bad, something something repression yet inexplicably fought them instead of working together toward a similar purpose."

Notice that the most critical of communism generally can't explain what exactly is wrong with it beyond accusing its leaders of being corrupt or accusing it of not working fully as intended. The kind of accusations that can be accurately levied at every "liberal democracy". And atrocities like the US's genocide of indigenous population is somehow not attributed to its political modes and it's free to take on a badge of being freedom free?