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having a uniform is a way to mold the school student's mindset to one that does not ask too many questions of the government or authority.

you just become another cog in the machine.  Same reason why the syllables includes many memorization tasks, but very little on problem solving and on critical thinking.

just take a look at the joke of Moral Studies.

The practice of wearing school uniform has been adopted by many other countries, and is now common in many parts of the world. Uniforms can be regarded as promoting social equality among students and an esprit de corps, but have also been criticised for promoting a form of uniformity characteristic of militarism.

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Depend how you see it, there is good and bad of it. Quoted was from wiki.
Again not that straightforward.