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Cigarettes and alcohol are more strictly regulated for children than for adults, but are regulated for both, because adults are allowed to harm themselves, but there is a general agreement that the law should discourage that. Yet the call for a social media ban on children is (or at least that's my impression) never accompanied with proposed regulation for adults, or a stricter enforcement of already in place but unenforced rules. I totally agree with you on how the "we shouldn't ban A, because then we should ban everything else" is a false argument, although it didn't seem to me that was the argument on the article (but close to everyone on HN catched that, so I'm going to read the article again with a fresh mind in a couple of days, maybe I just missed that)