As the arraignment nears in People of the State of New York v. Donald J. Trump, our own thoughts keep coming back to Nancy Pelosi. The former speaker greeted news of his indictment by declaring that “everyone has the right to a trial to prove innocence.” The formulation was, not to put too fine a point on it, completely ass-backwards. No person in America has to prove his innocence in criminal court. The sole burden of proof of a crime in America lies on the accuser.