>"In practice, it is seen more as an unwanted evil, like car crashes, than as bad choices that needs the attention of family members or mental health professionals."
What it needs to be is children not having unsupervised access to devices that have unrestricted internet access. Social media is certainly detrimental, but there are millions of other "dangerous to children" sites/apps, not to mention texting or media'ing to/from strangers. Children cannot comprehend or deal with the crap they read/see/hear on the Internet. In many, it can cause all kinds of agitation, addiction, bullying, psychoses, dysmorphia, depression, obsession, suicidality, etc.
Children do not need smart phones. If the parents want their children to have them, then the responsible thing is to lock them down with a very small whitelist of safe sites and apps, and call/text/media only to/from known contacts that the parent knows and approves. Same goes for tablets/laptops/desktops.
There is tons of good educational stuff available for devices without the risk of being brainwashed, picked on by other children, sucked into conspiracies, led down who-knows-what rabbit holes with hallucinating AI's, groomed by pedophiles, amplifying any stupid thing they might have ever written, lured into scams, thrust into adult concepts and conflicts, etc. It is hard being a minor, why would a parent want to make it 100 times worse? So it is convenient to shut them up? Because "all my friends do it"? Because it is cheap "entertainment"?