I think the individual freedom argument applies fully to schooling. Why -are- we teaching every single 13 year old the history of Henry VII? why -do- they have no choice? it's no different to forcing chess on people.
You can say every subject under the sun has value - it's true - needlework, say, has value - it's a truism; if someone is learning something, it's always a net gain. There IS no argument against teaching - not in terms of 'did you benefit'. But in terms of 'did you benefit as well, or nearly as well, as you could, given the cost and the other things you could have learned instead' - then needlework suddenly seems like a poor choice.
So does teaching every child in the country the same set of courses in the same way. Kids differ, in tastes, intellegence, maturity, you name it.
Regarding the restriction of individual freedom for children, I would say in general their parents are best placed - certainly far better placed than an education board - to decide what their child should be learning. Parents in general love their kids and want the best for them and listen to what their kid says, watch what their kid does.
I would indeed agree primary school is a case of forcing. It's a truism. Anything you -have- against your will is forcing. I also don't think school per se is necessarily a good idea. Indeed, I look at schools as institutions for the destruction of creative thought and intellectual curiosity. There is no more sure-fire way of alienating kids from education than forcing them to learn. Think of how kids in general view school - "oh God, do I have to do?" "thank God, it's the weekend!" "I'm ill, yay! no school!"
And maybe parents know school sucks. But since it's forced, people don't have much choice in how to express the fact that it's not a good idea - their kids -have- to go. In Germany there was a case recently where police raided the house of a couple who wanted to home-teach their kid and forced that kid to go to school.
When you don't have freedom, how can you find out if what you're doing isn't effective? you've blocked change.