People act based on their recognition.  If one believes that the only people with round tactile organs (hereinafter; Rounds) are genuine humans and the people with triangular shaped tactile organs (hereinafter; Triangles) are animals, he/she will treat Triangles as animals afterward.
Slavery
Thus large-scale slavery was born on this planet. It's hard to believe, but they kidnapped over 10 million Triangles, forced hard labour, traded them as a commodity, raped, imprisoned, tortured and killed for over several hundred years.

N.B. This is not related to slavery on this earth.

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