...So many people want this NAP type, libertarian, mutually agreeable relationship with their children. They don't want to be parents. They want to be partners.
However, they are not equal partners. Parents have to work to feed the kid, to keep a roof over them, to educate them. They are "enslaved" to their kids for their well being. This is natural. What is unnatural is to be enslaved to their well being, but then give them the freedom of someone whom you have no responsibility for. I don't have to work to feed some random person on the street, thus, I have no control over them.
Kids think their parents were put here to serve them because parents set up their lives that way. The parents don't act like parents, rather they act like servants. They don't rule their children's live, but they allow their children's lives to rule them.
You are required by nature to be enslaved to your child for his well being. You cannot simply "let them live". You have to work for them to make them live. If you do your job but then you don't "force" them to do theirs', then you create a person who feels entitled by the fact that you were enslaved to them for 18 years.
You are your child's dictator. This doesn't mean spanking is the best option, but it does mean that force is logical and moral with your children even though it is immoral against free adult individuals.
Free market capitalism isn't right for America because it works better. It's right because it's free (and it works better).