A Wisconsin prosecutor declined Tuesday to file charges against a white police officer who shot a black man in the back in Kenosha, concluding he couldn’t disprove the officer’s contention that he acted in self-defense because he feared the man would stab him. The Associated Press reports that the decision, met with swift criticism from civil rights advocates and some public officials, threatened to reignite protests that rocked the city after the Aug. 23 shooting that left Jacob Blake paralyzed.