If he's become actively hostile to libertarianism, then this is a reverse from his originial position put forth here:
That leaves libertarians. Now, I love libertarians to death. My CPU practically has a permanent open socket to the Mises Institute. In my opinion, anyone who has intentionally chosen to remain ignorant of libertarian (and, in particular, Misesian-Rothbardian) thought, in an era when a couple of mouse clicks will feed you enough high-test libertarianism to drown a moose, is not an intellectually serious person. Furthermore, I am a computer programmer who has read far too much science fiction - two major risk factors for libertarianism. So I could just say, "read Rothbard," and call it a day.
On the other hand, it is hard to avoid noticing two basic facts about the universe. One is that libertarianism is an extremely obvious idea. The other is that it has never been successfully implemented.
This does not prove anything. But what it suggests is that libertarianism is, as its detractors are always quick to claim, an essentially impractical ideology. I would love to live in a libertarian society. The question is: is there a path from here to there? And if we get there, will we stay there? If your answer to both questions is obviously "yes," perhaps your definition of "obvious" is not the same as mine.
I believe that this statement was not an endorsement of libertarianism, but rather a sop to libertarian readers, based on my knowledge of his style.
Moldbug draws a clear distinction between libertarian policies, which he believes meet straightforward criteria for effectiveness and sanity, and would (not ought to, but would) be implemented by a Responsible Government (see: neocameralism), and libertarianism as a political philosophy and movement.
He identifies the fundamentally Sisyphean nature of advocacy for libertarian politics within a democracy, and als...
I've seen several people on Less Wrong recommend Mencius Moldbug's writings, and I've been curious about how he became so popular here. He's certainly an interesting thinker, but he's rather obscure and doesn't have any obvious connection to Less Wrong, so I'm wondering where this overlap in readership came from.
[EDIT by E.Y.: The answer is that he's not popular here. The 2012 LW annual survey showed 2.5% (30 of 1195 responses) identified as 'reactionary' or 'Moldbuggian'. To the extent this is greater than population average, it seems sufficiently explained by Moldbug having commented on the early Overcoming Bias econblog before LW forked from it, bringing with some of his own pre-existing audience. I cannot remember running across anyone talking about Moldbug on LW, at all, besides this post, in the last year or so. Since this page has now risen to the first page of Google results for Mencius Moldbug due to LW's high pagerank, and on at least one occasion sloppy / agenda-promoting journalists such as Klint Finley have found it convenient to pretend to an alternate reality (where Moldbug is popular on LW and Hacker News due to speaking out for angry entitled Silicon Valley elites, or something), a correction in the post seems deserved. See also the Anti-Reactionary FAQ by Scott Alexander (aka Yvain, LW's second-highest-karma user). --EY]