It's the same reason that facial recognition has more false positives for people with more melanin in their skin.

This is not the real reason. It's because camera tech from more than 10 years ago was worse than today and had trouble with anything less than ideal lighting conditions. Darker textures reflect less light, so the darker someone's skin the less details a camera can see.

However we're still talking about a 0.001 FMR for white men to a 0.002 FMR for black men. That's "2x more false matches" but it's a 0.001 difference.

With modern cameras and recent facial recognition tech, the issue in differences of skin colour is virtually non-existent. Yes, I know of the news stories about false arrests in recent years, but no tech is perfect and you're talking about a few instances out of billions.

No, I'm not defending the use of the tech, just pointing out facts.