Your extreme example of a policy regarding distribution of heroin is far from perfect, but also far better than prohibition, which has visited upon the world more death, disease, crime, and cartel enrichment than perhaps any other policy in history.

But surely we can do better than either of these extremes.

No, but I'm not against selling alcohol and fast sports cars to adults, for example. I'm not very fond of a nanny state that prohibits almost everything to adults "for their sake" and because the government knows so much better.

I was replying specifically to someone who insinuated that all social media (or, at least, all supposedly addictive social media) should be banned for everyone, including adults. To me, it's a matter of personal freedom that they shouldn't be banned for adults.