Well they did work for free for decades and decades while owning nothing and being treated horrifically.
Let’s make the distinction between nonsense like BLM and the HORRIFIC institution of slavery in America.
Along with the sadistic punishments if they tried to escape.
But the freed slaves who later learned their letters wrote some immortal prose. Think Booker T. Washington, Frederick Douglas, Sara Heminges, or Solomon Northup. That body of literature more than makes up for Alex Heely’s plagiarism in Roots, or William Styron’s racist blather in The Confession of Nat Turner. Those that came through the crucible of slavery intact emerged stronger and triumphant. Generations later, some of black letters’ letters became toxic. But not all. There’s still plenty of valid black literature about the predicaments of blacks in modern life out there, such as the poetry of Langston Hughes, just for starters. Blacks’ contributions to thought and literature far outweighs the dreadful fact that slaves built the White House.