NEW YORK (AP) — For some Americans on opposite sides of a national debate, Michael Brown has become a symbol, epitomizing their polarized views on who bears the blame for the toll of young black men killed by police officers. Brown was a gentle giant, in one version. A defiant troublemaker, in another. Yet as more details of the 18-year-old's life and death emerge, his legacy in the eyes of many is more nuanced, reflecting the ups and downs and challenges faced by many young Americans.