Properly looked at, the real brainwashing ought to happen at home. I mean, a redgunamo will grow up a redgunamo, regardless of what any schoolteachers say. It's just as valuable for my boys to spend the day with me out coursing or playing video games or in the pub. I'm responsible for them, not whichever jumped up borstal they waste their days away at.
But now nobody has the time or the inclination to actually raise their children, so schools get to be more influential. Increasingly, parents use their kids' education to virtue-signal and to avoid admitting that they've f-ed up.