Because they think of their kids as obedient show dolls.
because of their big egos. They think the cuter they are the better they look
This question assumes that the reason why people have kids is to actually raise healthy humans, or some other noble but unlikely act of intelligence.<br />
Since most parents are half-dead, you should really have more compassion and understanding for them. All they're trying to do is enjoy the power trip of getting someone who shows signs of life to obey them. It's really one of the few pleasures they get. <br />
Of course, outside of the fun of slapping them around on occasion when it doesn't perform properly.
Some parents really do go overboard. Maybe they are living vicariously through their children???
Etiquette. Sometimes the things that slip out of their little mouths aren't so cute....