> Lots of parents don't have any other options but to put their kids in their local public school.

That's certainly true, but think about what you're saying. When a Midwestern state tries to outlaw the teaching of Evolution in public schools, which letter-writing political constituency do you think is behind it? How about sex education? How about the treatment of controversial topics like Marxism? All these hot potatoes are vetted by the parents of the students.

I'm not saying parents have realistic alternatives to public school. I'm saying they can whittle away a progressive curriculum, item by item, until you see a clear ground truth in many places -- enforced mediocrity.