School vouchers

Right wings radio hosts criticize public schools as being union controlled with lazy teachers. they always contend that Public Schools are failing our children
Many studies, like those administered by the National Assessment of Educational Progress, show that public schools are generally on equal footing with private schools. Students doing the same coursework perform about equally in both institutions. Studies that show otherwise do not take into consideration things like living condition of students, educational level of parents, learning disabilities, etc. When these things are taken into account, we get a dramatically different picture. Public school are equal to private schools. Private schools will not accept these students and they can be expelled from private schools. Why should the public pay to send any children to private schools?
Although it would be nice for poor children to attend good private schools if the parents wish, that doesn't mean that it is the government's responsibility to fund it. If private schools wish to have such children attend, they can offer scholarships. However, they do not want all the children to attend their schools. Once again it is a ploy of the right to privatize education. Public funded schools date back before our Independence.
What could be behind their desire to privatize schools? Could it be that private religious schools will teach our children to vote for Republicans?