I would suggest studying a bit more on the history of African Americans in the USA. While this was tragic and unjustified it was a more recent symptom of hundreds of years of systemic violence against people of color than a tipping point that changed everything. This horrible bloody path America has been walking down for generations and Mr. Floyd's murder was a fresh footprint.
OP my only argument is that your focus is too narrow. The circumstances that led to Mr. Floyd's murder did not come out of nowhere.
The state I grew up in would create postcards after lynches a few decades ago. That's the America I know.