In terms of the Herero people, they were also regarded as non-human & sub-human by those who administered that holocaust, including the scientists performing biological experiments on them.
The thing is, if the world had paid attention to what was happening in SouthWest Africa, the Nazi holocaust would not have happened.

Anyway, big props to Ida B. Wells, she was so brave for her time, and much more courageous than our modern day Black Journalists whose main concern is their pay checks.