I agree. No two sides to human trafficking. But be sure to remember the original, and very possibly the still active, slave traders in Africa: the Arabs. Read John Azumah Adembillah's book, The Legacy of Arab Islam in Africa, for a fuller picture. And google and read stories of the Zanj uprising where sugarcane was grown in the region of the Euphrates delta at a time when hardly any Europeans knew there were 'black' people.

Slave-trading, and subsequent racism, based on shade of skin is not confined to Europeans. And whether they spread such a bigotry to other peoples is debatable. If anything, they might have 'caught' it from those same Arabs.