alt Hacker News> If we agree that there exists at least one thing theoretically whose invention would be unequivocally evil
My issue is that your use of the phrase "exists ... theoretically" quietly steps across the boundary between ideal (where anything is possible), and real (where only some things are possible).
In other words, I think that Torment Nexus doesn't exist. Only its idea does, and I don't see how that's possibly sufficient. Kinda like faster-than-light travel - it would change a lot of things - but only it if would be a real thing. AFAIK to best of our understanding it's not. Even though the idea surely exists.
I rather think that it's the meme of Torment Nexus is the actual thought-stopper, because exploring what it could possibly be is what the meme warns one about.
It’s really not that difficult to come up with a Torment Nexus that, given enough money, could be built today. I’m not sure why you’re convinced it could not exist. Just browse a bunch of Wikipedia articles about torture and ethnic cleansing and general injustice and connect some dots.
Another point of the Torment Nexus is that it’s dark humor that science fiction writers especially will ideate something in their writing, and spend great lengths discussing the inevitable harm it unleashes, only to wait a few years and watch as someone actually builds the thing they basically warned everyone about. It’s a placeholder for “thing so bad that I don’t actually want to describe it lest some psychopath actually builds it.”