Because what constitutes as actual critical thinking, i.e. when do you know something over mere belief is a problem going back to ancient greece:

https://en.wikipedia.org/wiki/Allegory_of_the_cave

"Slowly, his eyes adjust to the light of the sun. First he can see only shadows. Gradually he can see the reflections of people and things in water and then later see the people and things themselves. Eventually, he is able to look at the stars and moon at night until finally he can look upon the sun itself (516a)."[2] Only after he can look straight at the sun "is he able to reason about it"

The fallacy here though is believing that there exists a teacher that can drag you out of the cave. I'm not some nutjob that believes in the government trying to indoctrinate our children, but my teachers happily repeated the whole bit about the personal carbon footprint to us, when years later it was revealed that it was a huge (and by reasonable thinking somewhat obvious) false flag campaign led by Exxon.