The most recent example of mass slavery, and the dominant experience in the Americas (including the USA) has been of black slaves with white slave masters. But if you look at the history of slavery, a different picture emerges – many of the slaves caught up in the Atlantic slave trade were enslaved and sold by black kings.
And there were white slaves too – Vikings made an industry out of taking slaves. Even the very word slave supposedly has origins in the defeat and enslavement of Slavic peoples.
Let us scratch the surface of those slave masters, slave traders, and those who enslave people and we find bad people. Those who fought against slavery were good people. There are also those who accept the prevailing conditions of their society and we can label these as neutral people.
If we judge people on their behaviour, we have good, bad, and neutral people (in their attitude towards slavery) and we don’t have any “but cases” (such as the British West Africa squadron or Mary Faber) to confuse things.
Doesn’t this make more sense than to use the colour of the dead stuff that keeps the squishy bits on the inside?