Veteran newsman Chris Wallace counts himself among the casualties of Fox News’ coverage of the Jan. 6 insurrection and the conspiracy-mongering leading up to the attack on the Capitol. With his CNN debut slated for Tuesday, Wallace told The New York Times he ditched Fox News in December — his employer of 18 years — because it had become detached from reality. “I’m fine with opinion: conservative opinion, liberal opinion,” he said. “But when people start to question the truth — Who won the 2020 election? Was Jan. 6 an insurrection? — I found that unsustainable.” After four years of lavishing pr…