"1) Assume every weapon is loaded - even if there's no mag and you've racked it, pulled the trigger, and racked it again 2) Never point a weapon at anything you don't intend to kill."
So as Rittenhouse was brandishing his loaded assault rifle at protestors, he was clearly threatening them. Rittenhouse was the deadly threat and the only person who killed anyone, which makes a total mockery of his idiotic defense that he acted in "self defence".