Earlier quoted context omitted.
Flagging “America’s most wanted” in public places like train stations or airports. Looking for missing children. Having home automation react differently to different family members. Those are all usages I am personally totally ok with.
Those are the 𝘄𝗼𝗿𝘀𝘁 possible uses for this. To illustrate lets imagine a really really good system that had a 0% false negative rate¹ , and a 0.000001%² false positive rate. If we were to sample the entire country looking the the FBI's most wanted we would end up with ~3290 matches, 3280 of which are going to be other people³. Considering high value of the individual the chances of harassment or wrongful arrest…
Even with the false positive rate it's much more likely an individual identified by the system is a target than a random individual.