Public education was originally created to indoctrinate people since childhood into the ideology of the nation-state. It did that through:
1. Ensuring that everybody spoke the same language
2. Transmitting the version of national history that strengthened the national identification
3. Fostering pride in the national achievements and the nation’s legitimizing figures (great artists, statesmen, etc)
4. Ensuring that everybody was prepared to inscribe oneself into the civic and economic functioning of the nation
Since there is no need for this sort of education any more, public schools now make sure everyone is indoctrinated into the ideology of fluidity.
Fluidity doesn’t need anybody to be inscribed into the civic life or the economy. So it dispenses with basic literacy and the knowledge of things like history or geography. Instead, it requires indoctrination into the principles of fluidity as its only subjects.
This is why students increasingly arrive in college with no knowledge of anything whatsoever except for how to put a fluidity-friendly spin on everything.
The question now is, why preserve public education at all? Because without it many people would be illiterate? They already are. That’s done.
What’s the point any more? Other than socializing the costs of globalization (from which you and I won’t profit), of course.