I am willing to concede that it perhaps cannot be deployed ethically, but for reasons unrelated to its accuracy. It may be that being able to find anyone put o

I am willing to concede that it perhaps cannot be deployed ethically, but for reasons unrelated to its accuracy. It may be that being able to find anyone put on a list is too big a concentration of power, even in light of the benefits. That's every bit as much a problem if the system is 100% accurate. If "find the people on this list, with near 100% accuracy" is something we're willing to accept, I think it's possible to build a system around this technology that doesn't deserve additional objection (outside detailed analysis of cost effectiveness or whatnot). That outputting "there's a 20% chance they're on the list" might be used to deliberately harass those who aren't on the list is an argument that you didn't make in your first comment. Certainly safeguards against such behavior would be a necessary component of appropriate use of the technology - but it doesn't seem technically or socially implausible. There's a wide margin between a system that outputs "we think this person is sketchy" and a system that outputs "we think this person might be that specific person."