According to Wikipedia, Roko's basilisk is "a thought experiment which states that there could be an artificial superintelligence in the future that, while otherwise benevolent, would punish anyone who knew of its potential existence but did not directly contribute to its advancement or development, in order to incentivize said advancement." Whew. Of course the phrase "otherwise benevolent" is entirely vitiated by everything else in that sentence. Assume that instead of an "artificial superintelligence" this is just a guy and he would be considered a psychopath, but probably a stupid one. You wouldn't create ethical thought experiments over the ramifications of his potential existence. You'd just resolve to smack him in the head if you ever met him. Somehow, though, Roko's basilisk has become a topic of debate among untold thousands of nerds.
I myself have a longstanding taste for what-ifs and abstractions that most people aren't thinking about. But there's a difference between thinking about weird mutations for your own amusement and maybe to get somewhere on another personal front; and forming your intellectual quirks into an all-encompassing ethic you believe everyone should obey. It's why I've never gotten behind utilitarianism, extreme rationalism, and the other markers of the San Francisco elite. Sam Kriss says that these philosophies are not for us--humans, that is--and he's probably right.
Kriss also traces the development of modern rationalism from Eliezer Yudkowksy's extensive fanfic Harry Potter and the Methods of Rationality. Which made me consider. There's another famed Harry Potter fanfiction from early in Web 2.0. My Immortal soaps up the Hogwarts gang in the context of the now semi-forgotten Hot Topic goth-emo scene of the time. It's bad to a legendary degree, but it doesn't pretend to be anything but silly. There's no philosophy based around it. The author isn't a major figure in tech culture or any other culture. We don't even really know who she is.
There's a lesson here somewhere.