The US spends a lot more than most countries on education, and for paltry results. Years ago, we could "afford" an incompetent government school system, because we had no competition in the world. That world is gone - we compete with a unified europe and increasingly india and the PRC. We can no longer be held back by a failed system.
The current government school system is a hundred years old and way obsolete. The liberals have turned US schools into madrassas-lite with political indoctrination. They are bloated with administrators. They retain incompetent older teachers because of the seniority system. They are way overpaid. They've failed at their job.
A universal privatized system would bring the efficiencies of the market to a sector that badly needs it. The fossilized administrative structure would be a thing of the past. Teachers would have to make good or hit the bricks. Excellent teachers might earn far more than they do now. Schools would become accountable to their customers - parents. Students would no longer be guinea pigs for pedagogical gimmicks like "whole language".
Non-poor parents should pay their own education bills - there's no reason at all why working people should have to subsidize middle class parents in this area with their taxes.