Over Protection = Harm

It's natural for parents to protect their children, but they shouldn't be overprotective.
Loving the children in excess will just make them become dependent on their parents and don't know the ways of the world.
Every child will grow up, they might become weak and fragile.
They might be easily defeated by frustration, depression or disappointment.
They might not afford to endure any trial or refusal...

Dear all daddies and mummies, if you're impossible to take care of your children for their lifetime, you've to train them to be independent when they're young.
The world is cruel, those on the outside will not love or care your children as you do. If you really wanna protect your children, you've to let them contact with the community and make them understand the methods to survive in this crude world.
Otherwise, you may regret when you find out that your over-protection harms your lovely children, you make them can't accommodate themselves to the society. That'll be too late to help your children then.