While I agree with your post, I think you should take another look the grandparent, it seems quite sarcastic.
We have our own ideologically blinded proponents espousing the supposed advantages of private vs public education in my country, with the difference that private schools are funded using the same means as public schools, they all get a set amount of money per student. It is now quite common to go to "free schools", these schools are allowed to profit from public funds and have both a large incentive to fudge the grades in order to make themselves look more attractive and an incentive to cut down on staff. They can get away with cutting staff because the free schools tend to attract the better students and can refuse students that require more attention, such as children with special needs. While Sweden still scores quite high on this test, we have slipped quite a bit, largely because differences between students have increased. Those doing poorly are now doing worse, stuck in schools where few of the students are doing well. This of course coincides with segregation in general being on the rise in this once-egalitarian country, but the free schools are certainly a major factor.