Isn't it obvious? Requiring someone to do something limits their freedom because they have to do it or get in trouble if caught. Perhaps a child is better off not entering school until years later, but the law requires that he do it now.
Parents should be in charge of their child's education. It's much better that way. Perhaps there's a medical reason why the child shouldn't go to school yet, or maybe The child is needed to help work for a while.
A medical reason is a perfect excuse to not be there. The next generation is our most precious thing we have and they should be given the best Education possible. As for work, school comes first so the family isn't locked into the cycle of poverty, they should receive welfare to make sure their kid can remain in school ,receiving education while making sure they can eat the next day.
Education isn't what causes riches. If someone doesn't want to be in poverty, it requires opportunity (which there is plenty of in the US), and willpower. I don't believe that welfare is good (in practice), but that's another matter.
America isn't the land of opportunity. Education does give more of it though. Don't work hard, work smart. We should teach our next generation to work together and help one another instead of compete. I think Welfare is good, but as you said that is a different topic.
America's capitalism makes it so that one can do just about anything for a living. Our economy is still good enough to support all Americans. Like I said before, you can require someone to sit in front of a speaker at age 3, but you can't make that person want to learn, want to make a lot of money, or want to do anything.
Yes, but you can inspire them. Over time ( Due to the growing Left in the Youth, and the dying Right ( The baby boomers are dying )). A more Left wing government will form. We still should teach our children that working together and helping everyone will do everyone the best.
Perhaps we succeed in changing it once, it won't stay that way. It is a powerful tool owned by our government which can be used for massive brainwashing/propaganda. It frequently is. Private companies will manage them so that they get the most students, which means the best or most popular education. Public schools (currently) just waste our money which it doesn't have on teaching kids to be stupid.