There is evidence of a growing consensus that this does have to be age limited. Both in the research and in voter polls. (I personally believe in it.)
> it will inevitably be worked around by motivated 13 year olds
The same goes for liquor and cigarette laws. They're still of net benefit.
The real answer to what's going on is one that HN doesn't like to consider. It's simply that a lot of people in a lot of countries are worried about what children are able to access on the internet and want the government to help restrict it.
I don't support these sorts of restrictions. However, HN seems completely unable to have a sensible discussion about them because most posters are convinced that this is all part of some kind of sinister authoritarian scheme. In reality, it's just some bad legislation pushed by various people who largely have good motives, and who are concerned about something that is a real problem.
The bad legislation should be opposed. In order to do so effectively, we have to address the actual concerns driving it, rather than railing ineffectually against a largely imaginary authoritarian conspiracy.