Because they are harmful. The worry is not online use, but online addiction. We don't just allow parents to regulate what drugs their children consume (medicinal), we trust medical practitioners for the correct dosage. Similarly, social media regulation should be done to achieve the same effect.
The failings of individual families have far reaching consequences beyond their own homes, especially in non collectivist societies that mostly put themselves above all others.
The failings of individual families have far reaching consequences beyond their own homes, especially in non collectivist societies that mostly put themselves above all others.