I think this is all pretty much true... but I still suspect that a lot of readers of that kind of article, if they learned that LW readers were mostly liberal/socialist, would be surprised and update a bit. Reading non-libertarian rationalists firsthand might do something similar.
ETA: That's not to say any particular publication strategy, or any publication strategy at all, would be effective, or that there wouldn't be other costs.
Cover title: “Power and paranoia in Silicon Valley”; article title: “Come with us if you want to live: Among the apocalyptic libertarians of Silicon Valley” (mirrors: 1, 2, 3), by Sam Frank; Harper’s Magazine, January 2015, pg26-36 (~8500 words). The beginning/ending are focused on Ethereum and Vitalik Buterin, so I'll excerpt the LW/MIRI/CFAR-focused middle:
Pointer thanks to /u/Vulture.