They have underfunded public education since the raygun era... It's also why they've defunded PBS and other education-related resources
Come on. US educational spending is VERY high on both an absolute and per capita basis, as has already been pointed out to you, and US education has been in decline since at least the 1960s. Arch-conservative (/s) Richard Feynman wrote in his autobiography about how shit our textbooks were when he was on the Arch-conservative (/s) California commission to help choose them. FWIW, I recommend reading this bit regardless of your political persuasion. I do have one quibble with it (personally, I think being able to move between at least base 2, 10, and 16 is actually quite useful, but Feynman was a physicist and not a sysadmin so her gets a pass) but it's illustrative of just how terrible our educational system is, and it is NOT a problem of money.
As far as PBS goes, if you want to know why it was defunded, start here. One of NPR's editors (yes, I know NPR and PBS are separate things), Uri Berliner, claimed that in the quarter century he worked there that it had completely lost diversity of thought, and that was a bad thing. The result is he resigned due to overwhelming hostility from his colleagues. When your Sarah Lawrence/Columbia educated editor, son of the woman who was the founding chair of Sarah Lawrence's Women's Studies department, grandson of jews murdered in Auschwitz, is ringing alarm bells and the response is to force him out... maybe you should be wondering if maybe he had a good point.
Note: I am not at all happy that CPB was defunded. As you noted, they do (or, I guess, did) a lot of great work. But the people steering the ship invited this outcome.