surely you don't actually believe that? I don't think the result of this is just 0 false positives. The result of that is a lot more crime, and a lot more injustice.
Unless the person above is, of course, an anarchist who has no answer for what to do about Richard Ramirez, Ted Bundy, Jeffrey Dahmer, Phillip Garrido, or Brian Mitchell. I would say that as imperfect and heavily flawed as our system is, "Perfect is the enemy of good."
Nothing. Those people are one-in-a-million anomalies. If it weren't for the media hype surrounding them, their impact on society would be comparable to the impact of deaths from lightning strikes. What do we do about people being struck by lightning? Nothing.