Confessed Highland Park shooter Robert Crimo III admitted to cops three years ago that he was a depressed teenage drug user when quizzed about threatening to “kill everyone” in his family, newly released documents show. A Highland Park police report details why the then-18-year-old alleged shooter was flagged as a “clear and present danger” in 2019 — just a few months before his dad helped him start amassing the arsenal he allegedly used to kill seven and injure dozens at his local Fourth of July parade.