My 'Felicity' at her state comprehensive is predicted a lot better than 4 as and the rest Bs anyway - and we are not unusual.
This is not a 'leafy comp' (?)
This is not a school anyone moves house to get into
This is not somewhere with an especially middle class intake
This is a normal school in a non-11+ area - if you took away set 1 from it and pushed them harder somewhere else, you might get an extra a* out of some of them, and you'd certainly bolster their confidence, and perhaps they'd have a nicer time, even. And then sets 2-5 stay in the same place but with no-one expected to do better than Bs and Cs, their aspirations are obviously going to be different.
I do not think that the parents using private school are necessarily going to come along and make state systems 'better' if you close the private schools. In fact, if the 'I'd trample on your head to get up the cliff face and therefore live my life according to this model' theme is widespread amongst such parents, they'd probably not help much at all.
However, you would remove a divisive and, IMO, odd and outdated situation where children are separated by parental wealth, and in which one lot is rarely exposed to the other, fostering ignorance and prejudice on both sides.
Why does a child at private school think he or she has been sent to private school, perhaps with considerable financial implications for the family, or perhaps not?
Because the schools in the area aren't considered good enough for him/her. What does this mean the child is likely to think about the other children in his/her community who go to those schools? At best that they are unlucky, at worse that they are less deserving (that they could go if only their parents didn't spend all their cash on nail extensions, holidays in Disneyland and cars other than 10 year old beat-up Volvos, perhaps). What are the children who do go to the state schools likely to think about themselves, and the children too good for what they've got?
And yes, you could say this about cars, holidays, houses, horses, out-of-school activities - life's not fair, etc. I would just personally argue that education is more important than any of those things in forming a child's chances and view of the world - which is I suppose the one thing I agree with the parents who openly explain that they've sacrificed those things so the child can go to private school!