No one cared about the "suppressed" Dr Seuss books. No leftist even remembered they existed, as far as I know. I don't see Biden or AOC, or for that matter Chomsky or Coates ever mentioning it. I'm a lefty-leftist and I don't care about those books at all - they aren't in the top 10,000 problems affecting the world.
Brace yourself - this was done to make money. Actually, this should not surprise you.
The publishing company did this to get a lot of excitable people all hot and bothered so they'd write free publicity for them and make them a topic of news.
And it worked very well, because you spent quite a long time on that article.
You should ask Penguin-Random House to pay you!