I came across this video which explains the progressive view of internet politics from their side: https://www.youtube.com/watch?v=P55t6eryY3g
It goes into who they view as "alt-right", what they think their opponents are saying and how they think the online world contributes to it all. Covers everything from Jordan Peterson, to Charlottesville, to nazis infiltrating gaming/anime/etc. It also has some hilarious quotes like, "There's a joke on the internet that nerds only perceive two races: white and political".
One of the central themes I got implicitly was that everything not progressive is Nazism. "Not-liberal", "alt-right", and "nazi" are used interchangeably. There's this strange argument that "Nazis are bad" is not a political statement since everyone agrees and that therefore "Nazis are good" is also not a political statement. This combined with the marketplace of ideas provides cover for Nazis to propagate their ideas.
At 18:08, he proposes an onion as a metaphor for the "alt-right". Each layer represents a red pill until a final red pill at the centre, which might be about Jews. He then says that number and order of these pills might vary. It seems like he's really trying to force the metaphor to frame anyone with non-progressive ideas as part of a heirarchy of forbidden ideas which culminates in anti-semitism.
The video lists 14 possible exits from the "cis het white male" centered world but my favorite is the last: "He may revisit an old belief system such as religion, social justice, or a really wholesome fandom (Steven Universe)".
Generally, my autoplay leads to communists like Slavoj Zizek that I just ignore, but i guess it's fun to see what the other side says too. I was frequently surprised to see how often this video validated my stereotypes of progressives. Anyways, 2/10 check it out for a laugh.
That may be. Admittedly I have little original source knowledge of Nazi ideology thought I am aware of some of those books they burned.
I do find it unlikely that they will be complete opposites though. There's too many dimensions to consider. Still, best of luck with your research. Perhaps you can make a blogpost or something.