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Lynd wrote a wonderfully insolent book in 1950 titled "Quackery in the public schools."
That's about 70 years ago. He nailed everything ahead of his time and it's still hot news.
The book is too expensive now, but here's my review: https://www.amazon.com/Quackery-Public-Schools-Albert-Lynd/dp/B001K...
Or read this piece on American Thinker called K-12: Quacks Rule which discusses the main points he makes in the book.
1950, that decade, was sort of a turning point. The Education Establishment assumed they could just walk through the schools and toss everything out. There was so little resistance, these geeks got sloppy and lazy. Suddenly there was book after book calling them Quacks, etc. After 1960, I think they got much sneakier.. All their theories and methods were sophistry but subtle.....If anybody wants more, I'll write an article or be interviewed.