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It's contempt for the Yudkowskyans ("AI doomers"), not contempt for the builders.

I find these threads deeply frustrating, as a long-time Yudkowskyan, because approximately zero of the critics show any understanding at all of the arguments involved, and the vast majority seem not even to have tried to understand the core concern. Most seem to be engaging in some kind of status demonstration, sneering at a group of panicked nerds, rather than having any actual technical opinion at all.

Unlike another poster, I don't think this indicates that HN is full of MBA types. Just average software engineers.