Building off what other people have said about humans and our ability to discern each other so well - Our abilities suffer greatly if we even attempt to reliably see the difference between people of ethnicities outside of our environment’s norm/majority. I can’t remember exactly what the source was, but I watched a shocking documentary on how many black people in America were convicted by white juries based on witness accounts saying “yes it was them, they did it I saw them!” And later released based on actual evidence proving they could not have committed the crime.