“Society holds the teaching profession in such low esteem, which has led to a massive teacher shortage,” writes one reader. (Photo by Ken Hively/Los Angeles Times via Getty Images)“How can public schools at once be hotbeds of radicalism, yet produce students who are so poorly informed about radical causes?” This was the central question of Robert Pondiscio’s piece, published June 12: “How Public Schools Became Ideological Boot Camps.”His answer …