The same should apply to money that we, the people, raise by taxing ourselves to educate our children.
Money is, after all, power.
Those who determine who gets the tax money that we have set aside for education will control the content of education. The teachers unions want politicians to control who gets education dollars because they know that their political power will allow them to control politicians, control education, and get more money for less work. The unions oppose having parents control who gets education dollars because they know that they cannot control parents politically. Parents are not elected. Political power does not intimidate them.