Re: Minors should be different
The question is more why aren't kids and teens shown the appropriate level of respect for their privacy in the real world /and/ online.
Not all parents are good people, some are evil abusive bastards who are good at presenting the illusion of good parents when others are around. I speak from personal experience here. You cannot know if the request has the best interests of the young person at heart and it's a dangerous assumption to make, just because one is a position of power and the other has virtually no rights.
The safest way is to refuse the requests, this they have done and I hope they'd do the same with a living young person.
If parents want to know what their kids are doing on acebook, they might try talking to them like actual human beings instead of going behind their back and eroding any trust they might still have.