A police officer whose shooting death of an unarmed 18-year-old ignited racial upheaval in a St. Louis suburb has been characterized as either an aggressor whose deadly gunfire constituted a daylight execution or a law enforcer wrongly maligned for just doing his job. Protester Hana Kato, of Tacoma, Wash., holds a sign that reads "Arrest Darren Wilson" as she attends an evening rally Tuesday, Aug.