Provide for the infrastructure and up keep of such, along with believing that quality of education is secondary to cost? Why are they allowing the country to crumble before our very eyes and then want to spend 100's billions on buying weapons that we don't need and the military doesn't want for the most part?
Probably because as with people in any party, there are the greedy and gluttonous who view material wealth (contradictory to the teachings some of those claim to believe in) as a sign of "goodness" and "success" and in recent decades, that group, in what was once more of a Grand Old Party, have dominated that party's politics, policies and attitudes and the nation (as spoken of for centuries of sages and predictable by history where rule by wealth and power eventually came crumbling down and the reasons why.) is not healthy and stable as a result.
The only thing such people seem to care to be conservative of is their obscene material wealth and the power and influence they believe they derive from it.
Because private schools are selective and cost beyond what most people can afford, the teachers are not subjected to having to teach children with severe learning disabilities and deal with all manner of afflictions some students have that are distracting to other students. In addition, because many of their parents must work, 2 to 3 jobs simply to make ends meet, the parents are working and not around to "teach their children well" many of the things parents naturally teach when they can be around their children more often, like "stay-at-home moms or dads.
Thinking and using one's mind to make connections and see the world beyond the boxes some keep themselves in is intelligence. It would seem the United States, perhaps the world, because populations of people, like growing puddles of water, are beginning to flow into one another. The people that use their minds to think and be intelligent are running into those who can't seem to use their minds to see how the world has changed due to the cumulative effect of what individuals do, which is far different than the effect they seem to believe they have on the world as individuals.
Some seem to think they are the only people on the planet and any of their activities are done in a vacuum of isolation. Others realize what would happen if the infrastructure built to make things like trash, garbage and human waste out of sight (and out of mind to the non-thinking) large populations could not be supported. They realize that as populations grow, so does conflict amongst people who have varying versions of "freedom" that often conflict with other people's "freedom".
They realize that as populations grow, so does the need for infrastructure, including not just a way to treat septic and sewage, but to keep drinking water clean, dispose of trash and garbage safely, educate children to some basic standard, all of which cost money.
The the greedy, on the other hand, some of whom claim "life" begins at conception and must be protected, at least until someone passes the hat their way to help protect that "life" after it truly is an individual separate from a womb it could not otherwise survive without, don't want any part of living less thnt an egotistical vain millionaire lifestyle in order to put their money where their mouths are with regard to precious "life". The only thing "precious" when it comes down to it, is their multi-million dollar lifestyles.