I'm not sure if this is part of your problem or not but say your colonist IQ is 100 they will still complain about education if there is no school for that, it's not just the dumb colonist that protest smart ones want to continue learning as well.
also this is just me but i execute all protesters lmao no room for lazy complainers in my colony.
You can do that if your colony is small or even average. If a person has over 100k or even above 50k colonists, the mass genocide is not a feasible way to solve it. And once you cross a 500k or even a million, I don't think you would ever like to see any approval problem. It just kills the game. However there are still ways to fix the education bug ;)
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