To be clear, there are a lot more downsides too. Sci-Fi dystopians bring up facial recognition technology a lot and about how the technology can be abused and help a government rule with authoritarian power. I do think it is important to think about these issues since democracy isn't stable (Before we start a flame war: I'm not convinced any system is and I think you'd be hard pressed to argue one is). We should consider the vulnerabilities to our system of governance and this seems to be a common one: tracking citizens. But I think in our society "potential of authoritarian takeover" (sometimes called "turnkey tyranny") is less of a concern for people than racial bias (which is still an important topic, don't get me wrong). I think the difference is that one requires foresight and the other is an effect we can see right now. And of course, historically we've seen minorities become the early victims of authoritarians.

We should think long and hard about these technologies and how to use them properly. Historically we haven't thought about ethics much in computer science, but the time isn't post hoc. We (Hacker News readers) are the experts, and we need to be talking about this decades ago, not decades from now. So let's not ignore the conversation.