It should be no mystery that state-provided education provides state propaganda. From Ryan McMaken at mises.org:
It’s been clear for decades that national news organizations such as CNN and the New York Times tend to be biased in favor of social democracy (i.e., “progressivism”) and what we would generally call a “left-wing” ideology. Journalists, for instance, identify as Democrats in far higher numbers than any other partisan group. And political donations by members of the media overwhelmingly go to Democratic candidates.
This is why even as far back as the 1940s, libertarian and conservative groups felt the need to found their own news sources, publishing houses, and other outlets for the distribution of information.
Similarly, in recent decades, higher education faculty have been shown to be overwhelmingly in favor of the Democratic Party, both in affiliation and in donations. In addition to providing instruction at colleges and universities, these people are the ones who write textbooks, history books, and the scholarly publications that influence other faculty members, secondary school teachers, and current students.
It would be shocking if the net effect of this clear bias were not to push the public—at least those members of the public who view news media broadcasts, read textbooks, and attend college classes—in the direction of the ideology favored by the journalists and professors.
But the means for manufacturing an ideological bias don’t end there. In recent years we have increasingly been seeing other institutions—outside newsrooms and universities—that are taking an active role in shaping the public’s ideology. These include social media firms, and even online sources of information once considered relatively outside the reach of political controversies.
This is what is to be expected when a single ideological group controls educational institutions and major media outlets over a period of several decades. Under these conditions—and unless other institutions provide an effective alternative—the ideology that is dominant within schools and newsrooms will spread to become the ideology of the larger general public. Thus, we should expect to see more and more doctrinaire ideological activism in the larger society, in Silicon Valley and beyond.