In 'no country for old man', the plot is complex and full of tension. There is a cat - and - mouse chase involving different characters. The story shows the brutality and randomness of violence. The main character finds a large sum of money, which sets off a chain of events. Each character is trying to survive in a world that seems to have lost its moral compass.
One main theme is the loss of innocence. The events in the story strip away any sense of safety and simplicity. Another theme is the inevitability of fate. The characters seem to be pushed along by forces they can't control. And also, the idea of a changing world that is no longer friendly to the old and the weak.
Well, 'The Man with No Country' is typically considered fictional. Authors often use their imagination to craft such tales for entertainment and to explore various themes and ideas.
No Country for Old Men is about a drug deal gone wrong and the subsequent chase. The sheriff, feeling out of place in this new, violent world, tries to make sense of it all and uphold justice.
Since we don't have much information about this specific 'blackkklansman old man story', it's difficult to say who the old man is. He could be a fictional character created to represent the older generation's experience with the KKK - related events in a story based on 'BlacKkKlansman'.