Funny, I have 3 kids, all of whom have attended public schools. One has graduated from college and is doing quite well in the real world, a second who rec'd a full scholarship to college, she's now a junior, and the 3rd is to enter high school next year, and she is more aware of the world around her than a good portion of the adults I work with.
The quality of the school system often has much to do with the quality of the parental involvement in said school system.
Your one size fits all analysis is simply flawed and the result of obvious, and not well thought out, bias.
Cheers.
Very well said.