Waar wrote...
horse shit, an opinion can be wrong...
500 years ago it was popular opinion that the world was flat, 100 years ago is was opinion that black people made good farm equipment, and 5 minutes ago my opinion of you was higher, lol.
but seriously, you're wrong and so is your opinion in this case.
That wasn't an opinion, that was an accepted theory by many people because they were too lazy to challenge it. People weren't wrong that black people made good farm equipment, they were easy to acquire and produced very cheap labour.