As a middle class person my family benefits greatly from the public school system. As a parent of a daughter with ADHD and severe dyslexia and dysgraphia there is no way I could afford to provide her with the private assistance she receives in school or send her to the nearest special needs school that specializes in her disability ( it's over an hour away and costs around 40k$). Your arguments about ESl programs are the same as the arguments many made (and still make) about ieps. But 1) kids are entitled to a free appropriate education. It's federal law. It's in many state constitutions. 2) kids who are educated actually become productive members of soceity instead of a drain on resources. If they can get an education and a job they contribute to the tax base for a heck of a lot longer than the time they were in school.And those services (ESL, special ed) cost money. Aren't the vouchers made available to all? Covering the gap is the same way the Earned Income Tax Credit and Child Tax Credits are sold, as a bridge to help people provide. Heaven forbid the middle class get something. To the critical infrastructure. So what, schools aren't doing a peachy king job now, therefore I'm not concerned with their infrastructure. I'm concerned with getting my child an education.
3) you you are assuming esl kids all come from poor families. In our case that is simply not true. Several of the families own small businesses in and near town. But all of the parents work.
As a member of society you should be concerned about the overall school health- public school health. Many great discoveries over the past 100 years have come from people educated in public schools. The person who eventually cure cancer is likely going to be educated in public schools. As a parent in concerned about my child getting an education. That is why when one said she was bored with math because it was too easy I spoke with her teacher and she is given more challenging math lessons. When the other could not read even close to grade level - i spoke with her teacher and we started the testing needed for her iep. When their teachers as for classroom donations we always participate because its one less thing for the teachers to deal with although I should be mad that they have to go begging for tissues and papertowels instead of being supplied with the items they need for their classrooms.
The us had a system of private and homeschool education and it worked for the elite but the poor and working class were without an education, so the public school system was started. Is it perfect no - I think there is way to much testing and not enough hands on learning and recess for the younger grades. But it provides access for kids. And a start.