Sackerson directed me to the following article: http://www.overcomingbias.com/2009/12/school-is-propaganda.html
In response, I argue that we have public schools because (based on the data):
a) they are cheaper than private schools;
b) they out-perform private schools, on average;
c) it is better to educate than imprison;
d) education is the only modern means for social mobility.