I was in Florida in May 2021 when I saw a white Mini Cooper with two seemingly incongruous bumper stickers.

One said, “I WILL NOT COMPLY” — a then-vogue sentiment as governments sought to mandate vaccines to fight the coronavirus pandemic. In a rear window, though, the car displayed a monochromatic American flag with one of the stripes rendered in blue. This, of course, is the graphical representation of the “Blue Lives Matter” mantra, an expression of support for the police that emerged as law enforcement began facing new criticism about the killing of Black civilians a decade ago.