We seem to have an idealistic debate here.
Interesting point that virtually all children in France go to state schools. I googled and found this which suggests that 15% of children in France go to private schools.
http://www.frenchentree.com/fe-educatio ... .asp?ID=95
I think in many capitalist countries there is a private school option. It is just that some English private schools have international reputations so are better known.
As far as the original poster's point is concerned, I do think there is a need for some positive discrimination by universities for pupils from state schools, precisely because it is harder for them to achieve the same grades as those in good private schools, given the same intelligence level and same motivation. Universities naturally want the best people on their courses and the best can also mean those with the best potential (so raw exam results are not the only measure of potential). I understand the same positive discrimination can happen at private secondary school level where the schools may have different expectations of applicants from state schools to those in private because they know they have not had the same opportunities.
I don't think private school parents need to be bothered about this 'positive discrimination' as the education bought still gives the children skills and abilities to take through life.
Speaking as someone who was state educated and went on the do a degree course that was dominated by ex private school pupils I would say private schools do develop a lot of 'soft skills' in pupils which help them be successful in life and it may be one of the reasons they dominate top jobs, not just the 'old boys network' although that may have helped them too. The old boys network is also about the parents connections in any case (and I have seen many examples in my working life of parents connections providing the much needed career break), not just about which school they went to.
Personally though I hate the attitude that something good and successful should be abolished because not everyone can have it. Its a horrible trait in British society that we resent anyone more successful than us. I never had these opportunities but so what? It is still possible with the right motivation to have a successful life and I don't begrudge people who work hard for extra 'luxuries' in life, whatever they may be! There is not equality in the state sector because there are better/worse opportunities depending on your postal address for example. The world is never equal but my view is we all have to make the best of what is available to us! We would have to live in a utopia with the same financial resources, same parental input, the same highly regulated and controlled level of schooling etc to all have the same equal chances in life!
As far as saying private schools are less successful because they enter fewer people for GCSEs, I think there could be many reasons for this, not necessarily that the schools are poorer quality. One reason, I would speculate, could be that they may be unimportant in the private sector where most pupils are aiming for A levels/international baccalaureat and degrees and will have done a broad-ranging exam at 13+ for common entrance to demonstrate their abilities in a range of subjects. Private schools with poor results are likely to fail as parents have the buying power to move their children elsewhere if they are not happy.