Earlier quoted context omitted.
That’s a good case for vouchers. Instead, kids with engaged parents will flee to better schools. The other parents will either follow, growing the new school and model, or the other school will adapt in order to retain students. Engaged parents are your early adopters. Without vouchers, most people can’t even afford to enter the market.
One of the purposes of public education is also assimilating children into the shared values of society. In the US this has been forgotten despite guys like Jefferson talking about this exact thing. The free market can be good at optimizing for certain outcomes, but I don't think you're going to get a lot of buy in with the current political climate being what it is, and a lack of consensus around what kind of outcom…
I'm not OK paying taxes to help Bobby Baptist send his kids to Jesus Is Lord Day School. Or kick in to rich parents' budget for Phillips Exeter. If we must have vouchers, let people keep their own tax money that would have gone to schools and use that for the vouchers. I'm not interested in handing people my cash to fund private education. I'm interested in having a public education system. That, I'll pay taxes for.