First and foremost dreads or knotted hair is not a black thing. It has been seen in Greece, Egyptians, and Nordic cultures long before the Trans Atlantic slave trade existed and here we are today. Your article then goes on to spill your racist narrative to compare fictional settings to prove your self interests. For example Black Panther is coming out with a predominantly black cast. For good reason, it takes place in a fictional part of Africa during an incredibly difficult time for this character. Do I believe even in comic book fiction that this part of South Africa is full of white Europeans? No, and thus the story and casting makes sense. This victim culture, and so called white washing is often not backed by actual facts, but rather written with emotion. Consider that Hollywood is predominantly white. Like science, people of color throughout history weren’t as interested until the last two decades. The industry by default has more experienced actors in category A, and while I understand I suppose your side of the looking glass, the best actor should get the role.
Hollywood in itself is fictional, and often laughable at times. It’s not as if they or the actors themselves actually care what you or I think. They know someone will pay to see it, even if just to write a shitty review.
You also failed to mention that writers even in fiction such as perspectives of a western society in a time portrayed say 100 years ago would indeed be mostly white. Is it plausible that the writer was influenced by real life? If there was not an influx of black people on the streets of London circa insert year, why on earth should we expect to see it? Although Will Smith was a fun character in The Wild West, that doesn’t mean it portrays reality, after all it’s science fiction.