Largely, it has to do with the reigns of our country being turned over to conservatives, republicans, and DINOs for nearly 30 years now. They do not value public education, have set about to de-fund it as much as possible.
We also spend more on attacking unrelated countries on the other side of the world, than we do on public eduction.
Parents, and people in general seem to think education is not important, which is wrong.
Television itself, has been dumbed down so badly some of the programs make me want to puke. I mean seriously, people watch other people degrade themselves, eat bugs, pigs intestines, old celebrities fight in boxing rings, even American Idolatry is suspect.
Republicans don't want a smart population, and they set about to keep them dumb. When folks are educated, they see through the republicans' bullshit, and they can't allow that, since republicans depend on deceiving, or manipulation through hatreds and prejudices, to get elected. A party that really only serves roughly ten percent of our countries people economically, can not survive with a smart population, in which they can't deceive 40 percent or so of them, into voting against themselves economically, because they hate black people, or they think the government's going to take their shotguns, or they hate homosexuals more than they want to make a living, or they don't want people to have the freedom to choose to have an abortion in the first trimester of pregnancy.
They promote this lie that education is "liberal" and in a sense it is. When people get smart, they begin to understand they don't stand alone, and that we are all in this together. But it isn't that the teachers are specifically hired for this reason, but that most people when educated, just come to that conclusion after getting some education.