Her motivations were simple enough. You could even call them pure.

“It wasn’t right,” said Darnella Frazier, who was 17 last year when she saw George Floyd pinned under a Minneapolis police officer’s knee. She said that to the jury last month as she testified in the murder trial of that former officer, Derek Chauvin.

No, Darnella, it wasn’t right, a Hennepin County jury agreed on Tuesday, finding Chauvin guilty of second- and third-degree murder as well as second-degree manslaughter.

After so many previous instances in which police officers were acquitted of what looked to many people like murder, this time was different. And it was different, in some significant portion, because of a teenager’s sense of right and wrong.

Call it a moral core.

On May 25, while taking her younger cousin on a stroll to get a snack, the high school student observed a struggle between a Black man and White police officer. After ushering the child into the convenience store, Cup Foods, Frazier stayed on the sidewalk and started recording.