What Chinese parents understand is that nothing is fun until you're good at it. To get good at anything you have to work, and children on their own never want to work, which is why it is crucial to override their preferences.
Chinese parents demand perfect grades because they believe that their child can get them. If their child doesn't get them, the Chinese parent assumes it's because the child didn't work hard enough.
Chinese parents believe that their kids owe them everything. The reason for this is a little unclear, but it's probably a combination of Confucian filial piety and the fact that the parents have sacrificed and done so much for their children.
Chinese parents believe that they know what is best for their children and therefore override all of their children's own desires and preferences.there is a lot to be said for believing in your children... and believing that they are good/better/best... and pushing them to be everything they can be, and exceeding their own expectations.
but, then again:
China's suicide rate among world's highest
Chinese Commit Suicide Every Two Minutes
... if they survive, they'll be AWESOME!