I did ask the question "is or should be?" ie "what should the purpose of school be?" or "what is the purpose of school?"
Yes, I can only speak from the experiences that my DD has had. However, I think the perception that all HE children are locked in with their parents all day, whereas all children in mainstream schools are being happily socialised, is far off the mark, and perhaps demonstrates the lack of knowledge and myths that surround HE (and also what goes on in the classroom).
I've never felt the need to justify home educating DD, however if you'd like to know why we arrived at the decision, here goes.
It was an instinctive response, having stood by (perhaps for too long) and watched DD not recognising her potential in classrooms where behaviour problems and PC thinking dominated the teacher's time. (School was rated 'Outstanding' in recent Ofsted BTW )
If I'd had the chance (the money actually) to send her privately, I certainly would have.
DD had completely lost confidence socially, having been thumped, kicked, bitten, headbutted, spat and sworn at. Her school work consisted of reciting 1-10 and being told off for trying to go on to 11. She was told off for asking for a harder reading book. Her bag at night would be full of pictures of Cinderella which she was expected to colour in day after day. Its taken quite a while to get her to regain her confidence. However, it took only a short while for her to make significant academic progress at home.
I have given DD the opportunity to return to school, and we even toured around a few schools. However, she still wants to work at home. One of her main reasons being that she "learns lots of things." And I must admit, touring around these schools, and seeing 30 children crammed in tiny stuffy (particularly noisy) classrooms, teachers being pulled every which way, kids arguing and fighting (one was even bashing another over the head with a wooden box last week in front of the teacher showing us around)and other kids milling about looking lost and confused, confirmed to me that we had made the very best decision, given our circumstances.