Of my 13 years of K-12 education, I spent 2 years in a public school, the other 11 in three different Catholic schools. Whatever the merits of your complaints about school systems, I think many of them would apply to many private schools too
There are at least four countries/territories worldwide (Aruba, Bangladesh, Sint Maarten, and Macau) where over 90% of secondary students attend private schools, public schools enrol less than 10% of secondary students – you think none of the private school students in those countries would sympathise with any of your criticisms?
> Public schooling can be directly traced back to protestants
You think Catholic majority countries don't have public education systems? In Brazil 86% of secondary students attend public school; in Portugal, 81%; in Argentina and France it is 74%; in Spain 69%; by contrast, Australia, a country in which historically Protestants have outnumbered Catholics by as much as 3:1, the percent of secondary students in public education is only 53%.
Sources:
- Public education rates worldwide: https://data.worldbank.org/indicator/SE.SEC.PRIV.ZS?most_rec... (okay, that's percent private, but subtract from 100 to get percent public)
- Australia historical religious affiliation statistics: https://www.abs.gov.au/ausstats/abs@.nsf/2f762f95845417aeca2...
As an aside, although Australia's Protestant:Catholic ratio was around 3:1 in the first half of the 20th century (and I believe through the 19th century too, although I don't have hard figures handy on that), nowadays there are only slightly more Protestants in Australia than Catholics – this is because, while both branches of Christianity have lost huge numbers of followers to secularisation, Catholicism has always partly compensated for that by immigration from Catholic majority countries (most recently the Philippines), Australia's post-1950 immigration patterns have left Protestants at a comparative demographic disadvantage – which I believe is true of the rest of the Anglosphere too