Could you elaborate on this?
Modern US Catholicism has, for a range of reasons, become very politically conservative (particularly in comparison to the Catholicism elsewhere in the Americas), and because Catholic schools are generally attended by the children of practicing Catholic parents whose conservative views shape their view of schooling, these private schools reflect those political views. As a result, if you aren't Catholic, many Catholic private schools are going to look like political and religious indoctrination.
The Seattle Archdiocese has created a haven for spreading diseases unheard of in public schools by not encouraging or requiring vaccination of students. The other nearby archdiocese do not permit unvaccinated students to attend, and haven't had repeated outbreaks of once banished diseases.
Could you elaborate on this a bit? I can imagine what might be different, but I'm curious what it was like in reality.
I'd be curious how large your sample size of unschooled friends was and what sort of longitudinal observations you had on their whole lives.
Quality public education can serve children much better than unschooling or poorly performing private or public schooling.
Some areas just have very little choice though, the Catholic Schools are shit, the public schools are severely underfunded and decrepit, and unschooling starts to look reasonable, despite how it seems to have stunted my friends :(