I often see critics describe it as pre-enslavement, but I really don't understand why. One common example of alignment today is parents teaching their children

I often see critics describe it as pre-enslavement, but I really don't understand why. One common example of alignment today is parents teaching their children to be kind and helpful rather than mean and combative. Would anyone characterize that as enslavement, or argue that it doesn't help kids to be raised this way?