The white supremacist narrative is a canard, and is used to manufacture consent for the power structure. I think this for a few reasons.
One is that racial motives are consistently assumed irrespective of evidence. I'm not aware of any incident of police violence during the summer of 2020 where evidence of racial motivation exists. Maybe there is in some cases, but if so it would be plastered all over the media. In the Floyd case for example he and the cop were former co-workers, so if anything, a more reasonable assumption is that there was bad blood or some sort of personal vendetta.
Second is that immersion in American culture reveals the opposite story. Say the n word (we don’t even say it, we instead say "the n word”), white lives matter, speak against BLM, have a confederate flag, etc. and you are a social pariah. Hated and denounced. Say black lives matter, whiteness is a problem, Trump is a racist neo-Nazi, etc. and you are cheered.
What is plainly observable is the opposite of the popular narrative: Not only do we not live in a white supremacist culture, but a white supremacist is regarded nearly universally as the worst thing you can be.
Third, the entire upper class promotes the white supremacy story. Every corporation had a BLM statement/logo, senators knelt with goofy African scarves and cheered on the riots, all major media/corporate press (save a couple commentators perhaps), and all of Hollywood/music was behind the protests. BLM raked in over ten billion dollars.
There were BLM logos painted in most major cities, mayors and cops kneeling in solidarity, an “autonomous zone” in Seattle that was tolerated for weeks, major entertainment platforms (Hulu, YouTube, amazon, and the like) putting black creators/themes on the front of suggestions, diversity measures in the military/public schools/businesses, and a summer of looting and torched buildings. All while talking head politicians excused violence and said “there should be more uprisings.” Many died. Almost no one talked about David Dorn, but George Floyd is granted sainthood, and Kyle Rittenhouse’s head must be put on a spike.
Then on the 6th, after a pro-trump protest at the capitol wherein an Air Force veteran was killed, the response is “insurrection,” impeachment, social media bannings, people snitching to the FBI, and statements from corporations vehemently denouncing it. And this time, unlike there being no evidence of racial motivation in the former cases, there are dozens of hours of hearings (maybe hundreds?), and hundreds (maybe thousands?) of pages of data analysis of evidence that the election was illegitimate.
What to conclude from this disparity? To bring it back around, I think the purpose of the white supremacy narrative is to manufacture consent. The nuts and bolts of gov’t and politics are boring. People aren’t into it. And if they aren’t into it, then they don’t respect institutions or have any love for them, but mostly ignore them. For such a person, the state is just something that gets in their way from time to time. Costs them money. But if you have a power narrative of some kind (what Curtis Yarvin calls an “anthem.” I take this idea from his essay “The Clear Pill”), a story that gives the listener meaning, then people are interested.
Racism is dramatic. The villains are hateable, and the heroes relatable. If politics is this cartoon of “white supremacy vs the heroic battlers against racism” then folks are not only engaged, but cheering on the elites - the security state, corporations, congress, Hollywood, the corporate press, etc. This is the picture the media paints of the world, despite its being contradicted by plain observation.
This isn’t to say racism doesn’t exist. If it didn’t exist, then the story would be too implausible. The narrative strains credulity now, but they’re not trying to manufacture consent using dragons or demons. Rather, they use something real, but rare. When racism is encountered out in the wild it is viscerally regarded as evil by most people. There might be a few places where it’s more common - perhaps in rural Appalachia or the Deep South - basically the poorest, least fashionable, most maligned regions of America. Thankfully, it is quite acceptable to hate and denigrate these people.