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Originally Posted by
Salento
...
learn how to question, and how to think for yourself.
... and so you don’t sound like a fool when speaking to other people

That's indeed one of the major purposes. Unfortunately, it can turn into a tool to brainwash a whole generation and create groupthink.
I sometimes think you're either born with a critical, skeptical mind, or you're not. :)
I'd add that one of the most important purposes is to teach people about the past. As I'm sure you've heard, "those who don't know history are doomed to repeat it." :)
That's why it's criminal that every graduate of a university is no longer "required" to take at least a year long course in world history. Heck, they should be required to take a couple.
Non si fa il proprio dovere perchè qualcuno ci dica grazie, lo si fa per principio, per se stessi, per la propria dignità. Oriana Fallaci