Public schools are cheaper. In my country, you would have to be rich to send your children to any good private school. Except you want to arrange for homeschooling, which might require either the wife or husband to stop working. Public schools might not be the best, but that's the only option some poor or moderate families have. But the parents have the responsibility of monitoring the topics or curriculum the children are exposed to. They need to redirect these children if the schools are deviating from acceptable beliefs or ideologies.