Racism is an ugly topic, so it should not surprise me that BlacKkKlansman is in some ways a movie about ugly people. Based upon the advance publicity, I expected it to be a little more whimsical, similar to the wonderful Logan Lucky, but the film's tone is somewhere between American Made and Edge of Darkness, but with less humor. Although the movie is described as a "comedy-drama", I fail to see how it is in any way funny. Perhaps the film is being misrepresented to promote ticket sales.
The movie is based upon the true story about how black police officer Ron Stallworth 40 years ago pretended to be a white racist on the phone while talking to KKK members so as to gain information about their activities. When he was required to make a personal appearance at KKK meetings, he sent a white undercover narcotics officer to represent him.
In the real story, no arrests were made and the investigation was shut down after nine months. The movie adds a bunch of fictional elements to make it more interesting, including a love interest, a terrorist bombing plot, and the notion that the white undercover officer was Jewish.
All the actors are good, but I especially like Topher Grace as David Duke. He has come a long way from That 70's Show.
As a fictionalized version of real events, the movie is plenty entertaining. However, it gets into murky territory when it implies that Donald Trump is the equivalent of David Duke, and the ending uses the protests and riots at Charlottesville to attack Trump and imply that racism is alive and well. At one point Klansmen are shouting "America First", adding another connection with Trump. To those who are the anti-Trump faithful, this may seem all well and good, but it disrupts the narrative of the movie to make a blatantly obvious political statement and one that at least some of us disagree with.
In fact, the movie tries to draw parallels wherever it can to the events of 40 or 50 years ago and the present day. It frequently talks about police officers shooting and abusing black men. However, racism is not near as extensive as it was 40 to 50 years ago. The membership of white supremacist groups is down to a few thousand. The actual facts about modern police shootings do not show a pattern of racial discrimination. We live in one of the most racially harmonious periods of our history, where we elected a black president, but the movie feels like it wants to agitate people about racial politics.
Regardless, the film tells a good, although a mostly fictional story, and is thought-provoking.