Fediverse

On the unlikely chance that the question isn’t rhetodical, I’d suggest Michael Parenti’s Blackshirts and Reds.

Its generic slop by anime standards. Like yeah anime is meant for teenagers and young adults so you can't be too critical over fanservice or flat YA novel Gary sue tier character writing or forgetting to write an actually compelling reason for the villain doing the bad thing at the start by the time the story wraps up. But you can at least try you know?

Anime in general is not meant to be high art but SAO goes the extra mile to be uninteresting bland slop that appeals to the lowest common denominator. The isekai genre has done a lot better over the decade since SAO initially released things like rezero or even Overlord blow it out of the water in terms of actually interesting plot and suspense. The only reason SAO is still popular is the high quality porn.

Trash.

the theory of communism doesn’t require human rights violations and restrictions of freedoms

Communism is a political ideology predicated on murdering a group of political enemies in the name of a pseudoscientific economic theory which is given the same reverence that Catholics do to church dogma. Communism is, and always has been, a cult.