It’s useful to remember here who it was doing the physical enforcement of white supremacy — it was law enforcement who enforced Jim Crow laws, who put down civil rights protests, who beat John Lewis trying to cross Edmund Pettus bridge for voting rights. https://www.google.com/amp/s/amp.theguardian.com/us-news/2020/aug/27/white-supremacists-militias-infiltrate-us-police-report
When politicians decided protests shouldn’t happen, Black people shouldn’t vote, Black children shouldn’t integrate schools, they called on law enforcement to enforce their desires, even when courts had ordered compliance with these rights.
Of course many police officers have nothing to do with white nationalist groups, but there’s never been a time where significant numbers did NOT engage with and share sympathies with white supremacists. The history of American policing begins in some places w the slave patrols.
So, what we saw yesterday, again, is both shocking and utterly within the realm of what we know this country to be. The way law enforcement responds to Black protestors compared to white insurrectionist the most predictable aspect of all of this.
The history of American law enforcement — taken as a whole— has always been to protect white people and control Black people.