School gives children one finite way of being recognised as meaningful. Getting good grades in specific subjects. Good at PE, Art, or DT? They don't care. This causes divisions, feelings of inadequacy and a 'rebel against the machine nature', if you're told you suck and you need to work harder and do more because the 'smart kids' either work hard or were just born with the right set of talents then how would you take that as a young adult or even a small child? Individuality is discouraged, pupils are squashed and manipulated to be a certain way and it shows. The supposed solution was participation medals for all but that makes it worse as things are ranked inherently and so students get picked on for fourth place ribbons, or distinctions in Art. These are the dissenters, those who lose interest and disrupt others. Very few kids are aimless. When i worked with younger students invariably the ones i was warned were 'troublemakers' were those who struggled or who couldnt do it and didnt want to try and fail because of the big red x showing all their effort wasnt worth it, or the D that no matter how hard they worked got them told off and their parents called in to school.
This doesnt cover the fact education teaches specific patterns of memorisation. There is no real consideration, no scepticism, no linking or rejection of incorrect facts. Even at uni level the way you are taught is to learn and regurgitate, to quote and to remember specific facts. When you train out the ability to think and act independently, you produce poorly adjusted adults who are by most counts relatively stupid in terms of actual understanding. They can quote Marx and Engels as well as anyone but cant critically analyse what he says, and this goes for many areas of study.