Interpret this history quote?!?

time period: french revolution/englightenment

why are black people enslaved? the color of people's skin only suggests a slight difference. there is no discord between day and night, the sun, the moon and between the stars and dark sky. all is varied; it is the beauty of nature. why destroy nature's work?

is this dealing with slavery as a social or economic issue.
im kind of leaning towards social.

also, please explain why?