JACK SHAFER: The L.A. Times was right to publish its expose on teachers. “The Times has done its readers a great service by exposing Duffy, Weingarten, and Nunez as enemies of open inquiry, vigorous debate, critical thinking, and holding authority accountable—essentially the cognitive arts that students are supposed to be taught in schools. That Duffy, Weingarten, and Nunez don’t bother to mount a serious defense of Los Angeles teachers indicates they have no case. Their only job—and they know it—is to protect the jobs of the members of their unions. . . . If you can’t grade the graders, whom can you grade?”