[it_citizen]

Clearly they cannot. They had already banned selling alcohol to kids.

[mirekrusin]

Drugs too. Doesn't seem to stop ones that want to do it though by looking at some neighbourhoods.

[nashashmi]

It does stop kids from being openly advertised drugs and makes it difficult for kids to get drugs. That is the whole point of legislation, not to eliminate but mitigate.

[mdp2021]

Given that incompetent families will always exist,

you ban drugs because of the social consequences of the phenomenon - the damages are evaluated as high.

For other indulgences, social damages may vary.