CHARLOTTE, N.C. — A North Carolina man is accused of striking a police officer with a large metal pole and punching others with his fists during the Jan. 6, 2021, riot at the U.S. Capitol. For David Gietzen, however, that may have only been Act One. After joining the unprecedented mob assault on U.S. democracy on Jan. 6, the 38-year-old Sanford man returned to the Capitol two weeks later on Inauguration Day planning to take part in a second violent attempt to keep Donald Trump in office, according to a report received by the FBI. In an affidavit unsealed this month, the FBI says it got word 10…