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Some people think that kids should study what they want. There shouldn't be math classes and art classes and geography classes and history classes. Kids should just "find themselves".
This is like putting someone in the pilot's seat who has never flown a plane. Kids, if they don't have math classes and art classes and geography classes and history classes and all that other stuff, they have no knowledge with which to proceed. They can't make a good decision about a life path. They don't know the options. A kid might potentially be a world-saving geologist but he might never accidentally stumble into geology as an option.
In fact, that might be the primary and best reason for grammar school at all. So that the kids -- under duress -- are introduced to the broadest range of options possible.
Freedom of choice is the worst thing possible for someone who isn't informed.