In the article is mentioned gambling, and how the rules are more stringent to children, but rules exists for both, and were put in place together. It seems to me (but I don't have social media, don't watch TV, and am not from UK, so I may just have missed that, so please correct me if that's the case) that the current discourse on social media is all about ban for under 16, but with no consideration on damage control for adults, so it's the "do somethings, but not to voters" situation. To your second point, we don't have research indicating social media is good for adults as well, so shouldn't the same precautionary principle apply for both (maybe with different level of precaution)?