Ah. I took the 'or anybody' to mean me, but see that you meant anybody who is anti-private school.
I will say that while I am not anti-private school, I do have serious reservations about public tax dollars being used to fund private schools. I find it abhorrent that tax dollars could be used to support a school that teaches intolerance or hate.
It's happening at public schools now. It's probably going to happen regardless, but I don't think public schools funded indirectly controlled by the public are going to be any more successful than letting parents decide what they will tolerate. Certainlly wouldn't have been true over most of our history, but I think you'd end up with less intolerance by leaving it to parents now.
Similarly, schools that teach what is not readily accepted science as determined by the dept of ed should not be able to receive tax dollars for student tuition.
I understand the concern, but that is a very slippery slope. Most people don't believe in science, seemingly especially the people that claim to believe in science. As long as people can do actual math, chemistry, physics, etc., I'm less concerned about what they learn in the less immediately applicable sciences, as society is and historically has been so bad at determining things like this politically.
Furthermore, any private school that receives tax dollars should have to be able to educate ANY students from the district in which the school resides. If private schools only take students that do not have learning or physical disabilities, then those groups of students are left out and the public school district continues to educate them at a higher cost per student than before(since lower cost students are gone along with the associated funding.
Schools are already provided more funds for special need students. If it's not enough to actually compensate the costs, I would say the fix is to not make them reliant on funds tied to other students. I also don't think every school needs to offer those services, as long as one in the relevant area does. I would envision something like the "provider of last resort" model used by some deregulated utility markets (but ignore how awful the term sounds; it just means someone retains an obligation to serve, not that they're the last and worst option).
^ Besides the obvious huge danger of this being allowed, which is that students whose education costs more will not be given access to that alternative education so many champion for, a real kick in the dick will be when testing scores are then compared and private schools who dont have the learning and physically disabled kids test higher than local public districts and those results are then held up as some sort of evidence that school choice works.
People are pretty much already savvy to this, as they try to correct for selection effects with charters. Where we do an awful job with this is traditional public schools. If you look at Mississippi's school ratings, it's largely just a ranking of the SES of the students with some outliers. I think we would have better public schools in general if we did a better job of separating test scores by socioeconomic status. And ideally race although that would be politically fraught. Parents look at middling rankings and think they may need to send their kids to private school, when if they looked at how kids from homes like theirs do (i.e., homes where people are invested enough in education to consider private school and have the resources to pay), they'd probably see that the public school is just as good if not better at least on the education side.
If private schools want to admit anyone regardless of physical or learning disability and the schools will not discriminate or teach pseudo-science and pesudo-history- sure lets try out vouchers.
I think I've more or less responded to all this above, but I'd also point out that you seem to be comparing a realistic voucher program to an idealized and non-existent version of public schools. Proponents of vouchers could just as easily say, if public schools want to stop leaving hundreds of thousands of kids without access to a decent and safe education, and stop having a significant number of their students end up in jail, and manage to avoid having teachers or administrators or coaches stop sexually abusing students another few million students in the future, then we can consider keeping the public school system as is.
Vouchers aren't perfect, but it would be hard to do worse for our poor children than we are doing now, and even if it didn't move the needle much, it would still be much better morally. We can't fix the home situation of every student, but we can at least provide an avenue for poor parents that care that doesn't involve them relocating to somewhere that's harder for them to afford.