Well, I will agree that our current public school system has really just become a series of left-wing indoctrination camps.
I went to public school in Santa Fe, NM, one of the most liberal cities in the nation. We were taught the purest forms of Darwinian Evolution. The students who believed in Biblical Creation were usually allowed to voice their opinions in science class, but it was only to give the teachers the opportunity to ridicule them publicly. We were taught the "values" of Feminism and transcendental meditation in English class. We learned how open minded and progressive religions like Islam, Hinduism and Buddhism were and how closed minded Christianity was, in Social Studies. We even had a German language teacher who would show pornographic German films to the class, so we could learn about German culture. Pretty much everything that is going on at college campuses right now I was dealing with in public school as early as 6th grade.
However, it has not always been like this. Public schooling is a Christian concept and was originally intended to be an evangelism tool. In fact, the very first public schools in America had only two books on the required reading list: the Holy Bible and the New England Primer
Here is an example of one of the lessons from the New England Primer, you can see that the concept of "separation of church and state" was not something that existed in the early days of America:
In fact, "separation of church and state" was invented in the 1950s based on an out of context quote from Thomas Jefferson.
Unfortunately, the Left-Wing Secular Progressives took over our schools in the 1970s and it's been a sharp downhill slide ever since. For the first time in any nations history, we've had generation after generation becoming increasingly less intelligent since the 1960s. In other words, My brother and I are less educated than our parents and my nephews will be even less educated than me and my brother.
Personally, I believe that's the Progressive's plan, if you have children who aren't capable of even reading the Constitution or the Declaration of Independence, in it's original form, then how can they possibly understand what their freedoms are? It gives the Secular Progressives the power to rewrite the Constitution at will because all the ignorant public-school students aren't smart enough to know any better.
But I digress, my whole point is that you are condemning the system based on the corrupt form that it takes today. It wasn't always this way. Just like hospitals weren't always run by greedy mega-corporations and doctors weren't always the glorified drug-dealers that many have become today.
In fact, the idea that every child deserved an education, regardless of social class, and every person deserved access to medical care were originally Christian concepts. Like public schools, early hospitals were founded by Christians and used as evangelism tools (nurses would often sit with the patients and read the Bible to them).
Unfortunately, like every human run institution, public schools, hospitals and churches are ripe for corruption and their values have decayed over the years/decades/centuries.