I disagree.
My son attends a fantastic private school. One lesson they do in sixth grade is go on a 4 day camp where they have a slave sale.
Students pick their role out of a hat and are an owner, a slave capturer, a slave seller, or a slave. Then act out their roles over several days.
Some slaves escape on the railroad, some are captured, etc.
When they come back, they have a much better idea of the whole concept.
The school has done it for years without complaint.
Many years ago there was a professor at Stanford who tried a similar exercise. Instead of owner/slave it was prison guard/prisoner. They had to stop the exercise half way through. It turned out badly.