The outrageous killings of George Floyd in Minneapolis and Breonna Taylor in Louisville are just two of the countless murders of black people by white law enforcement officers in American history. In this dreadful situation, we need to realize two things.

First, the murders of black people by police have nothing to do with what, if anything, the victim may have done. In these cases, Mr. Floyd may or may not have passed a counterfeit bill, and Ms. Taylor was asleep in her bed, a case of mistaken identity by the cops.

Second, while we know there are many fine law enforcement officers w...